Math, asked by neupane001, 11 months ago

plrase guzz help me prove that:2cos70°.cos20°=cos50°

Answers

Answered by Sreesha

1

Answer:

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#answerwithquality #bal

Step-by-step explanation:

2cosAcosB = cos(A+B) + cos(A-B)

= cos90 + cos50

= cos 50 (cos90=0)

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