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Vikram Shah

Questions (3)

find a,b and c if a(x+2)^2 + b(x+3)^2+c(x+4)^2 is identically equal to 2x^2+8x+6I tried a variety of different methods but could
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find a,b and c if a(x-1)^2+b(x-1)+c=x^2
1. 2 answers
2. 146 views
Prove that Acosx + Bsinx = Rcos(x+c) where c = tan^-1(B/A) and R = sqrt(A^2+B^2)
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Answers (2)

Thanks so much man
I just had a quick read of the response. The repsonse is excellent, however instead of multiplying both sides by 2 you could have just used the sinacosb and cosasinb identity immediately. This is a bit more complex, but I think it is easier to explain so

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