Question: In Exercises 15-24, use a double-angle formula to find the exact value of eac expression. 15.1-2 sin 75 16. 2 tan 75 1 -

In Exercises 15-24, use a double-angle formula to find the exact value of eac expression. 15.1-2 sin 75 16. 2 tan 75 1 - tan 75 17.2 cos 105-1 2 18.1-2 sin 165 19. 2 tan 165 1- tan 165 20. 2 cos 165-1 21. 1-2 sin 8 22.2 cos - 1 8 5 2 tan 12 23. 57 1 - tan 12 7T 24. 1-2 sin 2 12

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