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Grade: 11
        Sin x + cos x =√2 cos x then cos x - sin x is equal to   a)√2 cos x    b)√2 sin x    c)√2 ( cos x + sin x)     d) none of these
3 years ago

Answers : (1)

Shreyash Rane
45 Points
							
sin x+cos x=root 2 cos x
(sin x+cos x)^2=2cos^2 x
sin^2 x+cos^2 x+2sin xcos x=2cos^2 x
2sin xcos x=2cos^2 x
so therefore,here,sinx=cosx
therefore,cos x-sin y=cos x-cos x=0
 
D OPTION
3 years ago
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