Class 12- HOD-If x=cost + log tan t/2, y=sin t, find d2y/dx2 at t=pi/4

Class 12- HOD-If x=cost + log tan t/2, y=sin t, find d2y/dx2 at t=pi/4

Class 12- HOD-If x=cost + log tan t/2, y=sin t, find d2y/dx2 at t=pi/4 [CBSE 2012]