1) y'(x) = (-1/2)(x^2 + 1)^(-3/2)(2x) = -x/(x^2 + 1)^(3/2)
2) y = 4cos^2(3x) = 4(cos(3x))^2y'(x) = 42cos(3x)(-sin(3x)3) = -24cos(3x)sin(3x) = -12sin(6x)
3) f(x) = tan(pi/4 - x), f(x) = tan(pi/4 - x) = tan(pi/4) = 1
4) f(x) = -1/cos(5x), f'(x) = 5sin(5x)/(cos^2(5x)) = 5tan(5x)sec(5x)
1) y'(x) = (-1/2)(x^2 + 1)^(-3/2)(2x) = -x/(x^2 + 1)^(3/2)
2) y = 4cos^2(3x) = 4(cos(3x))^2
y'(x) = 42cos(3x)(-sin(3x)3) = -24cos(3x)sin(3x) = -12sin(6x)
3) f(x) = tan(pi/4 - x), f(x) = tan(pi/4 - x) = tan(pi/4) = 1
4) f(x) = -1/cos(5x), f'(x) = 5sin(5x)/(cos^2(5x)) = 5tan(5x)sec(5x)