Question

tell answered please with
$2$
steps

Answer 1

Let ,

X=sin−1(cos(3π4))

X=sin−1(cos(π−π4))

X=sin−1(−cos(π4))....→[∵2ndQuadrant]

X=sin−1(−1√2)....→[∵sin−1(−x)=−sin−1x]

X=−sin−1(1√2)

X=−π4

Hope you understand...
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