Q6 Q19.) Write the expression as the sine, cosine, or tangent of an angle. Then find the exact value of the expression.

1 answer:

3 0

Using sin(A+B) = sinAcosB + cosAsinB

sin20cos40 + cos20sin40 = sin(20+40) = sin60degree

= $\frac{ \sqrt{3} }{2}$

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Q6 Q19.) Write the expression as the​ sine, cosine, or tangent of an angle. Then find the exact value of the expression.