Question

if tan theta =-4/3,then cos theta=

Answer 1

Answer:

use the identity secsquaretheta= 1+ tansquaretheta

and get value of sectheta

then inverse the value of sectheta to get costheta, bcoz costheta is 1uponsectheta

Step-by-step explanation:

Answer 2

tan^2 teta is 1+sec^2 teta

then sec^2 teta is 1/cos^2 teta

so it becomes

(-4/3 )^2= 1+1/ cos^2teta

then

by solving above we get cos theta is

3/root 7