SOLUTION: given angle x is in standard position with its terminal arm in quadrant 3 and tanx= 7/5, find exact value of cos2x

Question 1205224: given angle x is in standard position with its terminal arm in quadrant 3 and tanx= 7/5, find exact value of cos2x
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

given:
angle is in standard position with its terminal arm in quadrant

=> ,

then
since and , we have

and

since and are in Q III, use

and

to find exact value of , use identity:

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