cos2x+c\cos 2 x+ccos2x+c
cosx+sinx+c\cos x+\sin x+ccosx+sinx+c
−(cosx+sinx)+c-(\cos x+\sin x)+c−(cosx+sinx)+c
cosx−sinx−c\cos x-\sin x-ccosx−sinx−c
\text { Answer:B & C }