Question #1cdb8

1 Answer
Noah G
Dec 14, 2017

We know that #sin(A + B) = sinAcosB + sinBcosA#, therefore:

#sin(20 + 40) = sqrt(3/2)#

#sin(60^@) = sqrt(3)/2#

We know from our special triangles that #sin(60^@) = sqrt(3)/2#, thus the statement is true.

Hopefully this helps!

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