Thursday

August 28, 2014

August 28, 2014

Posted by **Priya** on Thursday, May 1, 2008 at 2:11pm.

sin alpha = 3, -pi/2 < alpha <less then or equal to 0

How to get the answer of sin (alpha/2) = -1/square root 3, cos(alpha/2) = square root 6/3?

- trig -
**Reiny**, Thursday, May 1, 2008 at 3:55pmYou said "sin alpha = 3"

check your typing, the sine of any angle must be between ±1

Looking at your answers, α/2 is in the fourth quadrant, with x=√2, y=-1, and r=√3

**Related Questions**

trig - express 20sin theta + 4 cos theta as R sin(theta + alpha) R sin(theta + ...

trig - FInd the exact value pf the 6 trig function of alpha Given: point (-2,-6...

trig - evaluate the following in exact form, where the angeles alpha and beta ...

Trig - assume A= alpha using complementary rule how do I solve for alpha? cos(2A...

trig - Please find sin (alpha/2) and cos (alpha/2) sec alpha = 3, -pi/2 < ...

precal - when solving for all solutions how do I work out this problem: cos4(...

Trigonometry - Find the counterexample to shows that the equation sec (alpha) - ...

calculus - Interference Two identical tuning forks are struck, one a fraction of...

Trigonometry - Write cos(-83degrees) as a function of a positive angle Prove ...

trigonometry - given that sin alpha/2 = 2/3, and that alpha/2 is in quadrant II...