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Math · Trigonometry
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Write each expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression.

# 17, and 21 please!

In Exercises 15-22, write each expression as the sine, cosine, or tangent of a double angle. Then find the exact value of the expression 15. 2 sin 15° cos 15° 16. 2 sin 22.5° cos 22.5° 17. cos 75°sin275° 18. cos 105sin 105° 19, 2 cos2 π 20. 1 -2 sin2 12 2 tan 12 21. 1-tar- 12 2 tan 22. 1- tan?

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