lemonade

Verify the identities

1.

(1+sinx)/(1-sinx)-(1-sinx)/(1+sinx)=4tanxsecx

2.

(1+cos2x)/(1+sinx)=2(1-sinx)

What is the derivative of sinx?

derivative of tanxsecx.

Derivative of x^4

Find the derivative of d/dx

L is constant.

Thanks