Q.15 sin x + cos x = 1 if - (C) cos...
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Q.15 sin x + cos x = 1 if - (C) cos 3-) = -2 m)cos (x + 1) - te

JEE/Engineering Exams
Maths
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( sin x+cos x=1 ) ( sqrt{2}left(sin x cos frac{pi}{4}+cos x sin frac{pi}{4}right)=1 ) ( Rightarrow sqrt{2} sin left(x+frac{1}{4}right)=1 ) ( Rightarrow sin left(x+frac{1}{4}right)=frac{1}{sqrt{2}} leq 1 ) ( sin (A+B)= ) ( sin A cos B+cos A sin B )
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