Verify That Each Equation Is an Identity $$\left( 1 + \tan ^ { 2 } s \right) \left( 1 - \sin ^ { 2 } s \right) = 1$$

Verify that each equation is an identity.
- $$\left( 1 + \tan ^ { 2 } s \right) \left( 1 - \sin ^ { 2 } s \right) = 1$$