展开 cos(α)sin(α)left(sec(α)+csc(α))

解答

展开

cos (α) sin (α) l e f t (sec (α) + csc (α))

e l f t cos (α) sin (α) sec (α) + e l f t cos (α) sin (α) csc (α)

求解步骤

cos (α) sin (α) l e f t (sec (α) + csc (α))

= e l f t cos (α) sin (α) (sec (α) + csc (α))

使用分配律:

a (b + c) = ab + a c

a = cos (α) sin (α) l e f t, b = sec (α), c = csc (α)

= cos (α) sin (α) l e f t sec (α) + cos (α) sin (α) l e f t csc (α)

= e l f t cos (α) sin (α) sec (α) + e l f t cos (α) sin (α) csc (α)

e x p an d cos ((1 + n) π)

e x p an d \frac{2 s + 5}{( s + 1 ) \cdot ( s + 2 ) ^{2}}

e x p an d (100 - e^{0.1 q}) (q)

e x p an d \frac{1}{e} (x - 1)

e x p an d \frac{10 s + 8 e ^{- 3 π s} s + 3 - 3 e ^{- 11 s}}{s ( s ^{2} + 9 )}