Monday

October 20, 2014

October 20, 2014

Posted by **kiko** on Sunday, April 15, 2012 at 12:06pm.

- trigonometry -
**Reiny**, Sunday, April 15, 2012 at 12:37pmlet alpha/2 = A/2

sin A/2 = 2/3

then cos A/2 = √5/3

sin A = 2(sin A/2)(cos A/2) = 2(2/3)(√5/3) = 4√5/9

make a sketch,

opposite = 4√5, hypotenuse = 9

adj^2 + 80 = 81

adj = 1

sin alpha = 4√5/9

cos alpha= 1/9

tan alpha = 4√5

I am sure you can find the three reciprocal values

**Answer this Question**

**Related Questions**

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

trig - The terminal side of angle alpha is in the fourth quadrant, and sin alpha...

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

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

Trigonometry - Given that sin alpha = 15/17 and -360 <alpha<360 find all ...

Math - sec(alpha) = -4(√(5))/5 find exact values at alpha for the ...

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

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

Trigonometry/ Please Help - Given sine of alpha=2/3 and cosine of alpha is less ...

Trigonometry - Find the exactly value of sin2(alpha) if cos(alpha) = 4/5 (alpha ...