Q. 2 C5.0( 1 Vote )

Let us show that:

cos2 75° - sin215° = 0

Answer :

Given, cos275° - sin215°


Need to prove the given equation as zero


we know that cos(90 - θ) = sinθ


cos75° = cos(90 - 15)°


= sin15° - - - eq (1)


Substitute eq(1) in the given equation


cos275° - sin215° =


sin215° - sin215° = 0


Hence, proved


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