For each of the following integrals find an appropriate trigonometric substitution of the form x=f(t) to simplify the integral. a)x= ∫(6x2−7)3/2dx b) x= ∫x26x2+5‾‾‾‾‾‾‾√dx c) x= ∫x8x2−48x+67‾‾‾‾‾‾‾‾‾‾‾‾‾‾√dx d) x= ∫x−70−3x2+30x‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾√dx