Tangent line approximation. I need help with both 4 and 5.

4. Suppose the point 4 4 is on the curve sinx , smy =C, where C is a constant. Use 3 4 X y the tangent line approximation to find the y-coordinate of the point on the curve with x- coordinate . Be sure to show all your work. 3 180 5. Use tangent line approximation to derive an estimate for (1+ x)", when x is near 0, and n is any real number