Tìm nguyên hàm: -cosx/4 dx
Giải thích
\(\int {\left( { - \frac{{\cos x}}{4}} \right)} {\rm{d}}x = - \frac{1}{4}\int {\cos } x\;{\rm{d}}x = - \frac{1}{4}\left( {\sin x + {C_1}} \right) = - \frac{1}{4}\sin x + C\left( {C = - \frac{{{C_1}}}{4}} \right)\).