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1018
 one year ago
for y=4sin(3x), find y(pi)
1018
 one year ago
for y=4sin(3x), find y(pi)

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1018
 one year ago
Best ResponseYou've already chosen the best response.0oh wait sorry that's supposed to be y'(pi)

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0ok so you have to find the derivative of 4 sin3x

1018
 one year ago
Best ResponseYou've already chosen the best response.0oh wait i think i got it can you check if this is right

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0yea or you could write it as 12 cos (3x)

1018
 one year ago
Best ResponseYou've already chosen the best response.0thanks! may i ask, is this always the right way, because at first i thought i would use the chain rule on 4 and sin(3x)

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0sin (3x) is a compound function Ignore the 4 at first  just use chain rule on sin 3x . Finally multiply the result by 4.

1018
 one year ago
Best ResponseYou've already chosen the best response.0oh, so should i just ignore numbers that appears before the trig function? i should just do what's inside the funtion?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0yes  but of course dont forget to operate on them after you have done the differentiation

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0eg 2 cos 3x = 2 * 3sin 3x = 6 sin 3x

1018
 one year ago
Best ResponseYou've already chosen the best response.0yes, thanks! oh wait, last one, may you answer this? i think the answer is 0 but not sure

1018
 one year ago
Best ResponseYou've already chosen the best response.0y=12u u = x^3  2x^2 + 6 find y''(x=1)

welshfella
 one year ago
Best ResponseYou've already chosen the best response.0y = 1  2(x^3  2x^2 + 6) y = 1  2x^3 + 4x^2  12 what do you get for y' ?
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