algebraic expression

Okay. But I am not sure what's your level of education.. But I will still suggest three questions for you.

High School Level:

1. Show that e ^iθ + e ^ -iθ = 2cosθ. Hence, or otherwise, show that

cos^3θ = 1/4(cos3θ + 3cosθ )

2. ∫√x(ln √x) dx, find x.

Secondary School Level:

1. Differentiate √(4x^2 + 1)

2. x(x + √3)^2 + tan(x + 3)^2 = 10x, find x

hihi suki我係pauline呀
你出你題目我唔know點做