Question

18. If x sin (90° - 0) cot (90° - 0) = cos (90° - 0), then x is equal to
(a) 0
(b) 1
(C)-1
(d) 2
19. If A + B = 90°, cot B = 34 then tan A is equal to:
(a) 53
(b) 13
(c) 34
(d) 14
20. If cos (40° + A) = sin 30°, then value of A is
(a) 30°
(b) 40°
(c) 60°
(d) 20°
12
Q-2. Answer the following questions.
13
1. If Sec O= ind sino and cos 0
2. Evaluate 2 +an2 45 + cos230 - sin2 60
3. Evaluate Sin30 + tan 45 -cosec 60
Sec30 + cos 60 + cot 45
1. Evaluate : tan 30 sec 45 + tan 60 sec 30​

Answer 1

Given secθ.sinθ=0

⟹

cosθ

1

×sinθ=0

⟹tanθ=0

⟹θ=nπ where n=0,±1,±2,⋯