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Under root 2 + under root …

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Under root 2 + under root 2 + 2 cos 4 x is equal to 2 cos x
  • 1 answers

Khushi Singh 7 years, 3 months ago

L.H.S root2+underroot2(1+cos4x) =root2+undreroot2*2cossq2x =root2+2cos2x =root2*(1+cossqx) =root2*2cossqx =2cosx (* it means multiply) we use 1+cossqA=2cossqA in this ques. two times
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