trig identities

cos94 degrees cos18 degrees+ sin94 degrees sin18 degrees.

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

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  1. use the identity:
    cos(A-B)= cosAcosB + sinAsinB

    cos94°cos18° + sin94°sin18° = cos(94-18) = cos 76°

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  2. is that the answer?

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  3. yes, check it out with a calculator.

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