(cos(2x)-cos(4x))/(cos(2x)+cos(4x)) how does this fraction turn into (-2sin(3x)sin(-x))/(2cos(3x)cos( can you do a step by step proof to show how the 1st expression turns into the second expression?

Select the correct answer from each drop-down menu. rewrite the formula to find voltage. the formula for electrical power (p, in watts) is where v is the voltage in volts and r is the resistance in ohms. for a particular brand of water heater, r is 32 ohms and p is 0.5 watts. the formula to find v is , and the voltage at which the heater operates is volts.

Complete the table for different values of x in the polynomial expression -7x2 + 32x + 240. then, determine the optimal price that the taco truck should sell its tacos for. assume whole dollar amounts for the tacos.

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?