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Prerequisite for addition formula:


Proof of formula for sin(A+B):


Proof of formula for cos(A+B):


Proof of formula for tan(A+B):


Some C3 Trig stuff:


The product rule proof with limits:


Sam  G. A Level Maths tutor, A Level Further Mathematics  tutor, GCSE...

About the author

is an online A Level Maths tutor with MyTutor studying at Durham University

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