Math, asked by ajeet8948067987, 5 months ago

the value of cos20 cos70 _sin20 sin70

Answers

Answered by hansika5040

1

cosA cosB - sinA sinB = cos ( A + B )

Here A = 20 , B = 70

cos ( A + B ) = cos ( 20 + 70 )

cos ( 90) = 0

Hope this is helpful

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