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Answer:
(B) π/12 + π/6 k
Step-by-step explanation:
Points of inflection are where f"(x) = 0 and changes signs.
f(x) = cos²(3x)
f(x) = (cos(3x))²
f'(x) = 2 (cos(3x))¹ × -sin(3x) × 3
f'(x) = -6 sin(3x) cos(3x)
Using double angle formula:
f'(x) = -3 sin(6x)
f"(x) = -3 cos(6x) × 6
f"(x) = -18 cos(6x)
0 = -18 cos(6x)
0 = cos(6x)
6x = π/2 + 2πk or 6x = 3π/2 + 2πk
We can simplify this to:
6x = π/2 + πk
x = π/12 + π/6 k
Answer:
let the other number be x.
then,X+5=10
X =10-5
X=5
Step-by-step explanation:
Step-by-step explanation:
76 : 26
=> 76/26 (Fractional form of 76/26)
=> 38/13
=> 38 : 13
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Answer:no
Step-by-step explanation:z should be more than 12 like 13, 16.67,...
