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January 27, 2015

January 27, 2015

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

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