(sinax)(n)=(−1)^n−1.a^n.sin(nπ/2−ax)
=) y = 1/2.(sin 3x + sin 5x) - sin 2x
= 1/2. sin3x + 1/2.sin5x - sin2x
=) y(10) = 1/2.(-1)^9 .3^10.sin(10pi/2 - 3x) + 1/2.(-1)^9 . 5^10.sin(10pi/2 - 5x) - (-1)^9.2^10.sin(10pi/2 - 2x)
= -4853288