Hi, I got my test back and am able to do test corrections only by showing comple

Question

Hi, I got my test back and am able to do test corrections only by showing complete work with all necesary steps for each question. This is the test, ignore what i've already tried working out. whether its right or wrong ( i probably guessed and got it right because of luck) if you could show me step by step how to complete each problem i'd gladly appreciate it.

That is an imgur link to the calc test. The image file size was above 2MB so i couldnt upload here.

http://imgur.com/a/CUT0L

someone already did question 1 for me, Can you do question number 8 please?

Explanation / Answer

Solution:(8)

y = cos(3x)

y’ = -3 sin(3x)
y’’ = -3^2 cos(3x)
y’’’ = 3^3 sin(3x)
y"" = 3^4 cos(3x)
-----
y^(v) = -3^5 sin(3x)
y^(vi) = -3^6 cos(3x)
y^(vii) = 3^7 sin(3x)
y^(viii) = 3^8 cos(3x)
-----
f(73) (x) = [f(72) (x)]' = [3^72 * cos(3x)]' = -3^73 * sin(3x) So answer is B.

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