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I have posted a link there to this topic so the OP can see my work.Find the following integrals please show steps?

find the following integrals

a)integral -pi/2,pi/2(2t+cost)dt

b)integral x^3/(x^4+2)^2 dx

c)integral -2,2x(x^2+3)^2 dx

d)integral 0,pi/4 tan x sec^2 x dx