Posted by Aly on Saturday, September 4, 2010 at 3:02am.
tan x = -18/19
hypotenuse = sqrt (18^2+19^2)
= sqrt (324+361)
= sqrt(685)
sin x = -18/sqrt(685)
cos x = +19/sqrt(685)
sin (2x) = 2 sin x cos x
= -2*18*19/685
Related Questions
trig - Find the exact value of the trigonometric function given that sin u = &...
Pre-calc/Trig - If cot(a)=3 and sin(b)= (15/17) where a being alpha lies in ...
Calculus - Suppose that sin q = − 12/13 and that q is a Quadrant IV ...
trigonometry - 5. If cot 2θ = 5/12 with 0 ≤ 2θ...
Trig - If secx = 8 and -pi/2 < x < 0, find the exact value of ...
Math-Trig - 1. Create an algebraic expression for sin(arccosx-arcsin3x) 2. The ...
Math (Trig) - sorry, another I can't figure out Show that (1-cot^2x)/(tan^2x...
pre-calc - Can someone help me find the exact value of 4csc(3pi/4)-cot(-pi/4)? ...
Math - 1. Let (-7, 4) be a point on the terminal side of (theta). Find the exact...
trig - For each expression in column I, choose the expression from column II to ...
For Further Reading
