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Difficult

Cofunction Identities

SATSTM-YX15L1

Simplify the expression $\sin^{2}x+\sin^{2}\left(\cfrac{\pi }{2}-x\right)$

A

$\cos^{2}x$

B

$2\sin^{2}x$

C

$0$

D

$1$

E

$\text{Can't be simplified}$