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If Sin(y)=Sin(-1) (y) then?

Posted: Thu Jul 14, 2022 9:29 am
by answerhappygod
a) (1-y2)(1 – Cos2 y) = 1
b) (1-y2)(1 – Sin2 y) = 1
c) (1-y2)(1 – Siny)=1
d) (1-y2)(1 – Cosy)=1