3 years ago

How do you find sin20°cos40°+cos20°sin40°

Mathematics

1 answer:

Tems11 [23]3 years ago

3 0

That's of course the sum angle formula for sine

sin(a+b) = sin a cos b + cos a sin b

We have a=20° b=40°

sin 20° cos 40° + cos 20° sin 40°

= sin(20°+40°)

= sin(60°)

= √3/2

Answer: √3/2

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