15. (5 points) Find the exact value of cos(tan). Hint: Begin by drawing a triangle. 16. Verify the following trig identities: (a) (5 points) cos(0
15. (5 points) Find the exact value of cos(tan"). Hint: Begin by drawing a triangle. 16. Verify the following trig identities: (a) (5 points) cos(0 + ) = - sine (b) (5 points) sin r tan x + cost = sec
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