Math, asked by rajansonkar9899, 1 year ago

COS 20° COS 70°- SIN 20° SIN 70° KA MAAN HII

Answers

Answered by Anonymous

2

Answer:

cos20° cos70° - sin20° sin70°

cos20° cos70° - sin20° sin70°

= cos (20° + 70°)

[Using the formula cos(A + B) = cosA.cosB - sinA.sinB]

= cos90°

=0

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