1. Find an equation of the tangent to the curve at the point corresponding to the given value of the parameter. I +1, yat+t, t=-1. 2. Evaluate the integral f sin a cos dr by four methods: (a) the substitution u= cos z (b) the substitution u = sin z (c) the identity sin 2r=2 sin z cos I (d) integration by parts. Explain the different appearances of the answers.