Primitive of Secant Function

Also see

 * Primitive of Sine Function
 * Primitive of Cosine Function
 * Primitive of Tangent Function
 * Primitive of Cotangent Function
 * Primitive of Cosecant Function


 * Primitive of $\dfrac 1 {\cos a x}$


 * Primitive of $\dfrac 1 {\sin a x}$