Math, asked by thotapallipadmavathi, 8 months ago

cos(π/4 +x)+cos(π/4-x)=k.cos x then 2k2+5

Answers

Answered by yumnafatima66

0

Answer:

see it is very easy read once more of book

Answered by sreejakommi

0

Answer:

cos (a+b) + cos (a-b) =2cosacosb, so,k=root2 , so answer is 9

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