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4 September, 05:23

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

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  1. 4 September, 07:03
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    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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