Whether you're tackling calculus problems or preparing for standardized tests, understanding these fundamental relationships will give you a significant advantage.Think of trigonometric identities as ...

Replace \(\sin 2x\) with \(2\sin x\cos x\), take all the terms to one side, factorise close factorise To put an expression into brackets. For example, 18x + 12y = 6(3x + 2y). Factorising is the ...

Sec(a-b) = cos(a+b) / cos^2a - sin^2b I'm trying to prove this, by turning the left side into the right. I am stuck. Presumably you have already done the sum and difference formulas for sin and ...

Solve trigonometric equations in Higher Maths using the double angle formulae, wave function, addition formulae and trig identities. BBC Homepage Skip to content ...

The Pythagorean theorem is therefore equivalent to the equation sin 2 x + cos 2 x = 1. “A lot of the basic trig ‘identities’ are nothing more than Pythagoras’ theorem,” explains Anderson ...