Which of the following is a sinusoid? x^2+y^2=1 y=cosx or y=[x] or y=^3root x or y=cos x

y=cos x

Step-by-step explanation:

A sinusoid is a mathematical curve that describes a smooth periodic oscillation. Periodic means that the values and the shape of the function are repeated regularly. Sinusoid  is named after the function sine. The cosine function is just the sine function translated 90° to the left, so it's a sinusoid.

triangle abc is reflected on the line x=-6.5 then reflected again on the x axis

step-by-step explanation:

what is the original number? you forgot to add it.