Why didn't I learn this identity?

Geometry Level 1

-1 sin(y) cos(y) 1

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1 solution

X X
Apr 18, 2018

It equals ( c o s 2 y + s i n 2 y ) 2 = 1 2 = 1 (cos^2y+sin^2y)^{2}=1^2=1

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