1are th ans of 3 are b n d
1. ∫1/sin2x+cos2xdx =
a) -2cot2x+c b) tanx-cotx+c c) 9+(sec2x)/2 d) 3-tan2x/2 e) (3-sec2x)/2 f) (tan2x/2)-5
2. If vectors a+b=vector c then vector a x b =
a) c x a b) a x c c) b x c d) c x b
3. If the direction ratio of a line are 1 + λ, 1 – λ, 2 and it makes an angle of 60° with the y-axis then λ is.
(a) 1– √3 (b) 2 – √5 (c) 1+ √3 (d) 2 + √5
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6 Answers
1for 2
a+b=c
so a=c-b
now a*b=(c-b)*b
=(c*b)-b*b
=c*b (as b*b=0)
so answer is d