Discover Questions

4cosα((sin(α+β)cosβ - cos(α+β)sinα)
Can someone help? What is cyrosphere? Theories on what would happen if theoretically you survived entering a black hole. Beyond the physical effects.? I which the most force applied to nail on the wall and please can u explain? If f(x)=x^2-1 and h(x)=4x+3, then f(h(2))=?