Ask a New Question

find the exact value of sin 2α if cos α=4/5 (α in quadrant I)

1 answer

sinα = 3/5, so

sin2α = 2sinα cosα = 2(3/5)(4/5) = 24/25

Ask a New Question or answer this question.

Similar Questions

5. If cot 2�θ = 5/12 with 0 ≤ 2θ ≤ π , find cosθ, sinθ, and tanθ8. Find the exact value of sin2a if cosa = 4/5(a in
1. 1 answer
1. Find the exact value of 2tan pi/12 / 1-tan^2 pi/12root 3/3? 2. Given tanθ = -1/3 and with θ in quadrant IV, find the exact
1. 2 answers
4. Find the exact value for sin(x+y) if sinx=-4/5 and cos y = 15/17. Angles x and y are in the fourth quadrant.5. Find the exact
1. 3 answers
Suppose that cosx= -3/5 and x is in the third quadrant, and that siny= 2/9 and y is in the second quadrant. Find the exact
1. 1 answer

more similar questions