数学试题讲解

(1)

\int \sin^{2} x \cos x d x = \underset{―}{}

.

(2)

\int \frac{\cos x - \sin x}{(\sin x + \cos x)^{2}} d x = \underset{―}{}

.

(3)

\int \frac{\sin 2 x}{4 + \sin^{4} x} d x = \underset{―}{}

.

(4)

\int \tan^{4} x d x = \underset{―}{}

.

(5)

\int \tan^{3} x \sec x d x = \underset{―}{}