Compound Angle Formulae (Leaving Cert Mathematics): Flashcards

Trig identities for sin/cos/tan of sum or difference of 2 angles

$\sin A \cos B + \cos A \sin B$

$\sin A \cos B - \cos A \sin B$

$\cos A \cos B - \sin A \sin B$

$\cos A \cos B + \sin A \sin B$

$\frac{\tan A + \tan B}{1 - \tan A \tan B}$

$\frac{\tan A - \tan B}{1 + \tan A \tan B}$

Solve trig eqs, prove identities, simplify expressions

Do not apply

Divide sine formula by cosine formula

$\frac{\sqrt{6} + \sqrt{2}}{4}$

$\frac{\sqrt{6} + \sqrt{2}}{4}$

$\cos \theta$