If tan x =3/4 then cos^2x - sin^2 x =? – InterviewSolution

1.	If tan x =3/4 then cos^2x - sin^2 x =?
Answer» tanx = 3/4tan^2x = 9/16sec^2x - 1 = 9/16sec^2x = 25/16secx= 5/4cosx=1/secx=4/5sinx=√1-cos^2x=3/5cos^2x-sin^2x=16/25-9/25=7/25

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