How this engineer made classroom trigonometry click for the internet
A mechanical engineer who goes by the name Sajjan Purush on Instagram has transformed trigonometry lessons with practical videos.
In a sea of slick reels and over-produced ‘edutainment’, it took a man in a modest workshop, armed with nothing but math, metal, and clarity, to remind the internet what real learning looks like. When Paytm founder Vijay Shekhar Sharma shared a video praising a creator’s quirky take on trigonometry, few expected the man behind it, known on Instagram as Sajjan Purush, to become the unlikely face of viral learning overnight.
The video, which uses the catchy mnemonic “Bam Bam Bhole, Sona Chandi Tole” to explain sine and cosine, quickly struck a chord. But beyond the rhyme was something far more compelling: a rare ability to make abstract mathematics feel tangible.
A workshop where Trigonometry makes sense
Sajjan Purush, also known as Honey Dozer, does not fit the mould of the polished, English-speaking online educator. A mechanical engineer by training, he operates out of a workshop rather than a studio. There are no flashy transitions or curated backdrops in his videos. Instead, there is grease, machinery, and an ease with concepts that many struggle to grasp even after years of formal education.
And yet, that is precisely what sets him apart.
In one of his now-viral clips, he doesn’t just explain sin and cos, he shows where they live. On a lathe machine, in the angles of metal, in the precision required to align and cut. It is trigonometry not as a chapter in a textbook, but as a tool that is functional, immediate, and indispensable.
Why the Internet thinks he teaches better than professors
For a generation that grew up memorising formulas without ever quite understanding their purpose, his videos feel almost revelatory. Comments under his posts echo a similar sentiment: “We studied this for years, but this is the first time it makes sense.” Others have gone further, saying he explains mechanics “better than professors.”
There is a quiet irony here. In a country that often equates expertise with presentation, Sajjan Purush’s rise challenges that assumption. He may not wear crisp shirts or speak in polished jargon, but his command over his subject is undeniable, perhaps even deeper because it is lived, not just learned.
After Sharma’s post amplified his reach, Sajjan Purush responded with gratitude, acknowledging the support. But the real validation came from the internet itself, which embraced his content not as novelty, but as necessity.
At a time when education is increasingly moving online, his videos offer a reminder: clarity does not come from production value, but from understanding. And sometimes, the best teachers aren’t found in classrooms, but in workshops, quietly turning theory into something you can finally understand.
In a sea of slick reels and over-produced ‘edutainment’, it took a man in a modest workshop, armed with nothing but math, metal, and clarity, to remind the internet what real learning looks like. When Paytm founder Vijay Shekhar Sharma shared a video praising a creator’s quirky take on trigonometry, few expected the man behind it, known on Instagram as Sajjan Purush, to become the unlikely face of viral learning overnight.
The video, which uses the catchy mnemonic “Bam Bam Bhole, Sona Chandi Tole” to explain sine and cosine, quickly struck a chord. But beyond the rhyme was something far more compelling: a rare ability to make abstract mathematics feel tangible.
A workshop where Trigonometry makes sense
Sajjan Purush, also known as Honey Dozer, does not fit the mould of the polished, English-speaking online educator. A mechanical engineer by training, he operates out of a workshop rather than a studio. There are no flashy transitions or curated backdrops in his videos. Instead, there is grease, machinery, and an ease with concepts that many struggle to grasp even after years of formal education.
And yet, that is precisely what sets him apart.
In one of his now-viral clips, he doesn’t just explain sin and cos, he shows where they live. On a lathe machine, in the angles of metal, in the precision required to align and cut. It is trigonometry not as a chapter in a textbook, but as a tool that is functional, immediate, and indispensable.
Why the Internet thinks he teaches better than professors
For a generation that grew up memorising formulas without ever quite understanding their purpose, his videos feel almost revelatory. Comments under his posts echo a similar sentiment: “We studied this for years, but this is the first time it makes sense.” Others have gone further, saying he explains mechanics “better than professors.”
There is a quiet irony here. In a country that often equates expertise with presentation, Sajjan Purush’s rise challenges that assumption. He may not wear crisp shirts or speak in polished jargon, but his command over his subject is undeniable, perhaps even deeper because it is lived, not just learned.
After Sharma’s post amplified his reach, Sajjan Purush responded with gratitude, acknowledging the support. But the real validation came from the internet itself, which embraced his content not as novelty, but as necessity.
At a time when education is increasingly moving online, his videos offer a reminder: clarity does not come from production value, but from understanding. And sometimes, the best teachers aren’t found in classrooms, but in workshops, quietly turning theory into something you can finally understand.
