help me please 1)if tan 1/2 x = t. find cos x.

2)what is coeficient x^3 y^2 z^5 of expanded form (x + 2y - z)^10.

3)a = (2015)^(1/2015). proof that a^(a^(a^(a^(......))) (with the number of a is 2015) < 2015.

4)Given that x^2014 - 1/(x^2014) = 7. find x^2014 + 1/(x^2014)

5)gveni P(x) = 1-x+x^2-x^3+....+x^2014-x^2015. if P(x) substitute with y and y = x+1, what is the coeficient of y^4 ?

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