prove that if x and y are odd positive integers then x^2+y^2 is even but not divisible by 4
CBSE maths 9 th topic 1
2 cos^2x+3sinx=0
If (a,2a,b) is the centroid of the triangle with vertices P (2a,1,5),Q (-4,3b,-10), and R (18,14,2c) then find the value of a,b and c.
Find the derivative of x+cos x/tan x
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