Yall think this is true or do you think there is someone who actually makes life enjoyable?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

What is the slope of the line shown below?

For the quadratic function [tex]y=(x+4)^2-1[/tex] , do the following: a) rewrite the function in the standard form, b) rewrite the function in intercept form, c) find the vertex, d) find the y-intercept, e) find the x-intercepts.