Compound Angle Formulae
sin (A + B)
= sin A cos B + cos A sin B
cos (A + B)
= cos A cos B - sin A sin B
tan (A + B)
= tan A + tan B
1 - Tan A Tan B
A-level standard trigonometry. Maths all correct. Good pluralisation of 'formulae'. Neat handwriting. Loses a mark for 'Tan' instead of 'tan'. But otherwise: excellent work!
9/10
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