1.) Find and equation of the tangent to the curve at the point corresponding to the given value of the parameter

x= cos t + sin 2t, y= sin t + cos 2t (t=0)

2.) Find dy/dx and d^2/dx^2 for which values of t is the curve concave upward

x= t + ln t, y = 1 - ln t

x= cos t + sin 2t, y= sin t + cos 2t (t=0)

2.) Find dy/dx and d^2/dx^2 for which values of t is the curve concave upward

x= t + ln t, y = 1 - ln t