Posted by **Lucy** on Tuesday, August 23, 2011 at 2:47pm.

Find values of all six trig functions if sin(theta)= 4/5 and theta is in the second quadrant.

- Trig -
**Bob**, Tuesday, August 23, 2011 at 3:05pm
If sin(x)= 4/5 then O=4, H=5 from SOH-CAH-TOA. Using pythagorean thm. yields A=3.

cos(x)=A/H

tan(x)=O/A

csc(x)=H/O

sec(x)=H/A

cot(x)=A/O. In the 2nd quadrant sin,csc are positive, the other 4 are negative.

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