Question

please answer this imedietly

Answer 1

=) Sin0+ Sin^2=1

=) Sin0 = 1- Sin^2

=). Sin0 = Cos^20

Now on squaring on both the sides .......

=). (Sin0)^2 = (Cos^20)^2

=). Sin^20 = Cos^40

=). 1- Cos^20 = Cos^40

=). Cos^20 + Cos^40 = 1. Ans.


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