How can y = cos(x) be sketched in the vicinity of the origin.  How do I indicate the value at which the function crosses the y-axis and the value of x for at least one x-crossing?

Find an equation of the tangent line to the parabola y=3x2 at the point 1,3.

the range of y=cos 2x is

Over a 24-hour period, the tide in a harbor can be modeled by one period of a sinusoidal function. The tide measures 5.15 ft at midnight, rises to a high of 10.2 ft, falls to a low of 0.1 ft, and then rises to 5.15 ft by the next midnight. What is the equation for the sine function f(x), where x represents time in hours since the beginning of the 24-hour period, that models the situation? Enter your answer in the box. f (x): %3D Basic 7 8. 9. y Activate Windows Go to Settings to activate W 2 士 2$ CO 3. LO