Math, asked by soham1523, 10 months ago

Express as product Cos80°+cos40°

Answers

Answered by spiderman2019

0

Answer:

2Cos60*Sin20 = Sin20

Step-by-step explanation:

We know that CosA + CosB = 2Cos(A+B/2)Sin(A-B/2)

Cos80°+ Cos40° = 2Cos (80+40/2)Sin(80-40/2)

= 2Cos60*Sin20

= Sin20

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