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  1. C

    Mathematics: Post your doubts here!

    cos^3 x = (cos^2 x)(cos x) = (1-sin^2 x)(cos x) = cos x - (sin^2 x)(cos x) after integration, it become: = -sin x - (1/3)(sin^3 x) + c
  2. C

    Add Math help needed!

    n(AUB)=23-7 n(A)+n(B)-n(A ∩ B)=16 y+2y-x=16 3y=16+x y = (16+x)/3 to find minimum value of y, x must be minimum also, but x=0, y =16/3 and x=1, y=17/3 both y is not integer, so can't be the answer so, x=2, y=18/3 y=6
  3. C

    Mathematics: Post your doubts here!

    question 2 answer is it 0.496? question 3 answer is it 0.1587?
  4. C

    math hl question

    1st, you hafta start with this model: (√a+√b)^2 = a+b+2√(ab) sqrt of a+b+2√(ab) = √a+√b sqrt of 9+2√18 = ? by comparing the above 2 : sqrt of 9+2√18 = sqrt of 3+6+2√(3x6) where a=3, b=6 or vice versa, sqrt of 9+2√18 = √3+√6
  5. C

    IGCSE Maths HELP!

    P=k/Q^2 160=k/20^2 k=64000 P=64000/P^2 P^3=64000 P=40
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