Tuesday

October 21, 2014

October 21, 2014

Posted by **Aly** on Saturday, September 4, 2010 at 3:02am.

cot(x) = −19/18

,

where x is in Quadrant IV, what is the exact value of sin(2x)?

- trig -
**Damon**, Saturday, September 4, 2010 at 4:06amtan 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

**Answer this Question**

**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 ...

Trig - Use the given information to evaluate sin (a-b). Exact answers. No ...

Trig - Use the given information to evaluate sin (a-b). Exact answers. No ...

Trig hep, please? Thank you! - 1. Find the exact value of sin(195(degrees)) 2. ...

pre-calc - Can someone help me find the exact value of 4csc(3pi/4)-cot(-pi/4)? ...

Trig - Evaluate tan(a-b). No decimals. Only exact answer. Sin a = -7/25, cot b...

Trig - Evaluate tan(a-b). No decimals. Only exact answer. Sin a = -7/25, cot b...

trigonometry - 5. If cot 2θ = 5/12 with 0 ≤ 2θ ≤ π...

Trig - What is the exact value of tan(s+t) if sin(s+t)=56/65. And cos(s)=5/13 ...