Left hand Trigonometry

To overcome this, Harini devised an interesting way to learn Trigonometry ratios. She advises her students to:
a) Keep their left hand open
b) Fold the finger according to value of degree
c)  For sinθ, count the number of fingers which are down the folded finger
d) For cosθ, the count is for the number of fingers above the folder finger.
e) √number of fingers/2 = sinθ and cosθ

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