7. sin 2A = 2 sin A is true when A
(a) 0° (b) 30° (c) 45° (d) 60°
2 tan 30°
8. The value of
is
1-tan? 30°
(a) sin 60° (b) cos 60°
(c) tan 60°
(d) sin 30°
9. 9 sec? A - 9 tan? A=
(a) 1 (b) 9 (c) 8 (d) 0
10. (1 + tanA + secA) (1 + cotA - cosecA ) =
(a) (b)1 (c)2 (d) -1
11. (sec A + tan A) (1 - sin A) =
(a) sec A (b) sin A
(c) cosec A
(d) cos A
12.
1+tan? A
1+cot? A
(a) sec A
(b)-1
(c) cot² A
(d) tan’ A
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