ThePrismSolutions

ThePrismSolutions

DAILY PRACTICE PAPER(9Th June 2018)

Q. d20(2cosxcos3x)/(dx)20 =

(a) 220(cos2x-220cos4x)      (b) 220(cos2x+220cos4x)

(c) 220(sin2x+220sin4x)      (d) 220(sin2x-220sin4x)

Q. If y = log{log(logx)}, then dy/dx = :

(a)  1/log(logx)      (b) 1/xlogxlog(logx)

(c)  1/xlog(logx)      (d) none of these

Q. If x = a(cosθ + θsingθ), y = a(sinθ - θcosθ), then d2y/dx2 =

(a)  sec3θ/aθ        (b)  sec2θ/θ

(c)  aθcos3θ         (d) sec2θ/a

Q. If x√(1 + y) +y√(1 + x) = 0, then dy/dx =

(a) (x + 1)/x          (b) 1/(1 + x)         
(c) - 1/(1 + x)2        (d) x/(1+x)

Q. If y = xtany, then dy/dx =

(a) tany/(x - x2-y2)      (b) y/(x - x2-y2)    

(c) tany/(y - x)          (d) tanx/(x - y2)



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