Write a algebraic expression for c=12b

Given (1+cosx)/(sinx) + (sinx)/(1+cosx) =4, find a numerical value of one trigonometric function of x. a. tanx=2 b. sinx=2 c. tanx=1/2 d. sinx=1/2

Which of the following expressions are equivalent ?

Which expression is equivalent to7_/x^2 ÷ 5_/y^3? assume y# 0