Question

(sec A+ tan A) (1-sin A) equals to

a)cos A

b)sin A

c)tan A

d)none of these​

Answer 1

Answer:

(sec A + tanA) (1 - sin A)

= (1/cos A + sin A/cos A)(1 - sin A)

= (1+sin A/cos A)(1 - sin A)

= (1 - sin²A/cos A)

= cos²A/cos A = cos A

Hence answer is a)cos A