Question

Ques- (1)-- 0-625 can be written in the form P/q as
(A) 1/16

(B)1/8

(C) 5/16

(D) 5/8

Ques (2)--- The value of

cos2 25° – sin2 65°
sin2 39° + sin2 51°

(A) 0

(B) 1/2

(C) 1

(D) -1
​

Answer 1

Question,,1.

$0.625 \\ = \frac{625}{1000} \\ = \frac{5}{8}$

So,, The option D is correct answer...

Question,,2.

$1. ) \cos^{2} 25 - \sin ^{2}65 \\ = \cos^{2} 25 - \cos^{2} (90 - 65) \\ = \cos^{2}25 - \cos^{2}25 \\ = 0 \\ 2.) \sin^{2}39 + \sin^{2}51 \\ = \sin^{2}39 + \cos ^{2} (90 - 51) \\ = \sin^{2} 39 + \cos^{2} 39(by \sin ^{2}theta + cos ^{2} theta = 1) \\ = 1$

Hope it helps