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Write the expression as the sine, cosine, or tangent of an angle.

sin(2π/9)cos(3π/8)+cos(2π/9)sin(3π/8)

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Stella/Gray/Stacy -- please use the same name for your posts.

mmmmhhhh
I believe sin(A+B) = sinAcosB + cosAsinB
compare this to what you have

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