展开 (cos(a)-sin(a))(sec(a)+csc(a))

解答

展开

(cos (a) - sin (a)) (sec (a) + csc (a))

cot (a) - tan (a)

求解步骤

(cos (a) - sin (a)) (sec (a) + csc (a))

Apply FOIL method

(cos (a) - sin (a)) (sec (a) + csc (a)) : cot (a) - tan (a)

= cot (a) - tan (a)

e x p an d 2 x (e^{x} - 1) - 15

s im pl i f y (x + 2) (x + \frac{5}{4}) (x + \frac{1}{2}) (x - \frac{1}{4}) (x - 1)

e x p an d P (\frac{0.1}{2 , 1}) Q (2, 1, - 3)

e x p an d \frac{- 3}{4} sec^{3} (\frac{π}{2})

e x p an d A (2, 7) y B (- 6, - 9)