Math, asked by aryashishir098, 9 months ago

Cos^2 48°- sin^2 12°

Answers

Answered by akshayaakshaya184

7

Answer:

cos(A+B)cos(A-B)= cos^2A-sin^2B

=cos(48-12)cos(48+12)

=1/2 cos36

1/2×root5+1/4

=root5+1/8

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