Why do the trig addition formulae work?
Try differentiating:sin(x)cos(z-x)+cos(x)sin(z-x)with respect to x and for constant z, then simply the derivative you deduce, then integrate throughout the simplified equation. See what happens!
Related Maths A Level answers
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Find the coordinates of the points where the lines y=x^2-5x+6 and y=x-4 intersect.
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