Prove that :
cos(x/4)=3/8+1/2cosx+1/8cos2x
anyone plz help me with this

The number of possible solutions of a polynomial can be found by looking

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14