Question

if 1 + Cos A into 1 minus cos A is equal to 3 upon 4 find sec a​

Answer 1

Step-by-step explanation:

here is your answer and once try to solve it yourself

Answer 2

Answer:

sec A = 2/√7

Step-by-step explanation:

(1 + cos A)(1 - cos A) = 3/4

1 - cos²A = 3/4                                  -------   (A+B)(A-B) = A² - B²

cos²A = 3/4 + 1

cos²A = 7/4

cos A = √7/2

sec A = 2/√7                                     -------  (1/cos A = sec A)