2)
3(sin(x))(x^2+2)-3cos(x)(2x)
3)
(-1/2)*x^(-3/2)
4)
(sin(x))^(-2)*cos(x)=ctg(x)/sin(x)
5)
(4x^3*(3-x)+x^4)/(3-x)^2
6)
2x-1/(sin(x)*sin(x))
(-8x+3y)(5y+x)-(-6x+4y)(3y-5x)=
1) x = -3/14
2) x = 2,625
3) x = -1/9
4) x = -1 1/3
5) x = -48,26
6) x = -2/3
7) x = 0,6
8) x = -3
9) x = 10
10) x = -5
11) t = -3/8
12) y = -2
13) p = 11
14) k = -9,7357441
15) c = 2 1/6