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## Main Question or Discussion Point

I am in Calculus 2 and we're just reviewing calc 1. Can someone break down the concept of differentiating definite integrals for me? I am mostly struggling on the trig functions. The problem I am stuck on is

∫[itex]^{}x[/itex][itex]_{}0[/itex] cos(t[itex]^{}2[/itex]) dt

∫[itex]^{}x[/itex][itex]_{}0[/itex] cos(t[itex]^{}2[/itex]) dt