Math, asked by manikandanR, 11 months ago

solve cos80+cos40=cos20

Answers

Answered by sahilsinha143

1

Answer:

cos120=cos20

=>cos 60= cos

Answered by kaashi18

0

Answer:

cos80°+cos40°=cos20°

2cos(80+40)/2.cos(80-40)/2

2cos60°.cos20°

2*1/2.cos20°

cis20°.

Hence, proved

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