Question

1. If cotQ = 7/8
evaluate : (i)
(1 + sin Q) (1 - sin Q)/
(1 + cos 0) (1 - cos )

(ii) cot2Q​

Answer 1

Answer:

(i)49/64 , ii) 7/4

Step-by-step explanation:

(i) =(1-sin²Q)/(1-cos²Q)

= cos²Q /sin²Q

=cot²Q

given = cot Q = 7/8

=cot²Q=(7/8)²

=49/64

ii) cot 2Q = 2×7/8 =7/4