Posted by **David** on Monday, June 14, 2010 at 8:46pm.

cot (theta)=-9/8, cos (theta)<0

- Math -
**Reiny**, Monday, June 14, 2010 at 9:21pm
Are we solving for theta ??

if so, then

tan Ø = -8/9 and if cos Ø < 0

Ø must be in quadrant II

angle in standard position is 41.63°

( since tan 41.63° = +.888889 or 8/9 )

so Ø = 180 - 41.63 or 138.37°

check:

tan 138.37 = -.888889

cos 138.37 is negative.

Change your calculator to Radians if you want those units

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