Question

sketch one cycle of the cosine function y=-cos 3θ

Answer 1

its the same as we did for the sin function.

since it is negative function it will be negated. And the actual period of a cosine function is 0 - 2π. So substitute Θ = 0 - 2π and find the corresponding period. when you multiply Θ by 3 the period changes.

So try and see what you get.

f(x) = ACos B(x-h) + k

Same as sine function. only sin and cos has a phase shift

Answer 2

would it be

Answer 3

yes