Question

( 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 )

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

Solution