Looking for the area of a regular figure would be taking the longest side and the shortest side and multiply
Step-by-step explanation:
You have to do first and second derivatives :
y = a sin 3x + b cos 3x
dy/dx = 3a cos 3x - 3b sin 3x
d²y/dx² = - 9a sin 3x - 9b cos 3x
Next, you have to compare it :
let d²y/dx² = ky,
-9a sin 3x - 9b cos 3x = k(a sin 3x + b cos 3x)
-9(a sin 3x + b cos 3x) = k(a sin 3x + b cos 3x)
Therefore, k is equals to 9.
6+(-2)+2•(-8)•42=6-2+(-16)•42=4+(-672)=4-672=-668
Answer:
135
Step-by-step explanation:
15 x 9 = 135
