Some videos I've made

Prerequisite for addition formula: https://www.youtube.com/watch?v=iHZmi2MHqWc
 
Proof of formula for sin(A+B): https://www.youtube.com/watch?v=BEETggUVMrY
 
Proof of formula for cos(A+B): https://www.youtube.com/watch?v=gTpNnlRxnIY
 
Proof of formula for tan(A+B): https://www.youtube.com/watch?v=D5VJiL0DMWU
 
Some C3 Trig stuff: https://www.youtube.com/watch?v=Gcby6WYAVKg
 
The product rule proof with limits:https://www.youtube.com/watch?v=9FRFRVTUthk
 

Answered by Sam G. Maths tutor

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