SOLUTION: find the exact values of sin(2u), cos(2u), and tan(2u) using the double-angle formulas. Given: cot(u)=-3, 3π/2 < u < 2π

Algebra ->  Trigonometry-basics -> SOLUTION: find the exact values of sin(2u), cos(2u), and tan(2u) using the double-angle formulas. Given: cot(u)=-3, 3π/2 < u < 2π      Log On


   

Question 1177237: find the exact values of sin(2u), cos(2u), and tan(2u) using the double-angle formulas. Given: cot(u)=-3, 3π/2 < u < 2π
Answer by Solver92311(821) About Me  (Show Source):
You can put this solution on YOUR website!


Since is in the fourth quadrant, , and .

















But since



Then:











But since



Next:









Or you could just use



to get the same answer.

All you have to do is plug in the numbers and do the arithmetic.

John

My calculator said it, I believe it, that settles it

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