4. If sin x + sin?r=1 then the valu...
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4. If sin x + sin?r=1 then the value of cosx+cos x = (a) 1 (b) 0 (C) -1 (d) 2

JEE/Engineering Exams
Maths
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( sin x+sin ^{2} n=1 ) ( sin x=1-sin ^{2} x ) ( =int sin x=cos ^{2} x ) squandes ( Rightarrow sin ^{2} x=cos ^{4} x ) 2) ( frac{1-cos ^{2} x}{cos ^{2} x+cos ^{4} x=1} cdot cos ^{4} x )
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