Asked by El chapo

Use Determinants To Solve The Simultaneous Equation
X-3y+2z=19
2x+y-3z=17
Answered by El chapo
(2) Evaluate Xcos2xdx?
Answered by oobleck
Since you only have two equations, you can't use determinants, as there will be no unique solution

I assume mean
∫x cos2x dx
Using integration by parts, with
u = x, du = dx
dv = cos2x dx, v = 1/2 sin2x
∫u dv = uv - ∫v du
∫x cos2x dx = 1/2 x sin2x - 1/2 ∫sin2x dx
I expect you can finish that up, eh?
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