Inverse+function


 * == Straight Line ==
 * == Exponential Function ==
 * == Multigrade ==
 * 1) === #1 f(x)=xⁿ, n = - 3, f(x) = 1/x³  ===
 * 2) === #2 f(x)=xⁿ, n = - 2, f(x) =   1/x² ===
 * 3) === #3 f(x)=xⁿ, n = 2, f(x) =  x²===
 * 4) === #4 f(x)=xⁿ, n = 3, f(x) = x³ ===


 * == **Trigonometry** ==
 * 1) === ** #1 f(x)=sin(x)** ===
 * 2) === ** #2 f(x)=cos(x)** ===
 * 3) === ** #3 f(x)=tan(x)** ===
 * 4) === ** #4 f(x)=ctg(x)** ===
 * 5) === ** #5 f(x)=sec(x)** ===
 * 6) === ** #6 f(x)=cosec(x)** ===


 * == **Examples** ==