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
SG
Related Maths A Level answers
All answers ▸The curve C has equation 2x^2y+2x+4y-cos(pi*y)=17 A) Use implict differenciation to find dy/dx B) point P(3,0.5) lies on C, find the x coodinate of the point A at which the normal to C at P meets the x axis.
Differentiate sin3x-3x= f(x)
Let f(x) = 2x^3 + x^2 - 5x + c. Given that f(1) = 0 find the values of c.
Two lines have equations r = (1,4,1)+s(-1,2,2) and r = (2,8,2)+t(1,3,5). Show that these lines are skew.