Math, asked by sangharshvmore, 11 months ago

2sin40.cos20 evaluate

Answers

Answered by priyanshuranjan343

1

Answer:

answer is cos 70

am I right pls comment.

Answered by HashtagNoName

7

Answer:

Identity: 2sinAcosB = sin(A+B) +sin(A-B)

sin(A - B) = sinAcosB - cosAsinB

2sin40cos20 = sin(40+20) + sin(40-20)

= sin60 + sin20

=√3/2 + sin20

≈ 1.20804

sorry, that's the best I can do...

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