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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If given two parametric equations for a curve, how would you work out an equation for the gradient?


Line AB has the equation 3x + 5y = 7. Find the gradient of Line AB.


Simplify (5-2√3)/(√3-1) giving your answer in the form p +q√3, where p and q are rational numbers


Find the gradient of the tangent to the curve y=4x^2 - 7x at x = 2


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