prove that:- sec raised to 4 theta - cos raised to 4 theta=1-2 cos square theta
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sin4θ+cos4θ=(sin4θ+2sin2θcos2θ+cos4θ)−2sin2θcos2θ
=(sin2θ+cos2θ)2−2sin2θcos2θ
=1−2sin2θcos2θ
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=(sin2θ+cos2θ)2−2sin2θcos2θ
=1−2sin2θcos2θ
I hope that it will help you
#belieber
#loverofjustinbieber
pallupradhan162:
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