SOLUTION: if sec theda = (-13/5) and 90 degrees < theda < 180 degrees , find the exact value of cos2 theda

SOLUTION: if sec theda = (-13/5) and 90 degrees < theda < 180 degrees , find the exact value of cos2 theda

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Question 1155006: if sec theda = (-13/5) and 90 degrees < theda < 180 degrees , find the exact value of cos2 theda
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

if and degrees ,
find the exact value of cos2 theda (theta)-> not quite sure if you have cos(2theta) or

if you have
use theta in quadrant II [° to °]
if

then

if you have =>
and
=>
=>

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