Math, asked by tpmini6, 1 year ago

cos (36-x) cos (36 +x) + Cos (54 -x) cos (54+x)=Cos 2x

Answers

Answered by dk859389

1

Answer:

It is proved and solution is given in the image.

Step-by-step explanation:

These formulas are used

2cosAcosB = cos(A+B) +cos(A-B)

cosC+cosD = 2cos(C+D/2) cos(C-D/2)

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