Basic Trigonometry Concept | Trigonometric Ratios | Trigonometry formula | Sin cos tan | INPS Class

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Excellent Sir Your videos are really very Authentic Your focus is only on content not on Promotion of your coaching like other Institute Very Honest Teacher you are sir always give your blessing to us.

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Best Video for Trigonometry i have ever found on KZbin Thank u so much sir

[@animeshtyagi1650]

Best video for basic trigonometry

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Nitin Sir is Best of INPS Classes most honest and most Sincere Teacher

[@nishamathur3685]

Great Delivery of concepts Thank you so much sir

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You are most welcome

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[@tanyabajpai2387]

Thankyou for this video sir that too in a very systematic manner.

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Most welcome

[@kanchankalyanikolte5968]

How is sin(90-72) = cos 72°?

[@yashisingh317]

Since sin(90-theta)= +cos theta As it lies in first quadrant And sin (180-theta)=-sin theta As in the graph of sin theta interval changes after ever 2π So angle remains same

[@abishekraju4521]

@@yashisingh317 Sin(180-theta) would be +sin(theta) not -sin(theta)

[@abishekraju4521]

Because, sin(90-72) is in the first quadrant, so no sign change. sin(90-theta) or for any odd power of (90 +/- theta), sin(theta) changes to cos(theta). And so, sin(90-72) is equal to cos(72).

[@yashisingh317]

@@abishekraju4521 yes I wrote it by mistake sorry