Use the squared identities to simplify 2cos^2x cos^2x
a.) 3-4cos(2x)-cos(4x)/4
b.) 3+4cos(2x)-cos(4x)/4
c.) 3+4cos(2x)+cos(4x)/4
d.) 3-4cos(2x)+cos(4x)/4

Complete the square to determine the minimum or maximum value of the function defined by the expression. x2 − 12x − 2 a) maximum value at 38 b) minimum value at 38 c) maximum value at −38 d) minimum value at −38

Bring the fraction a/a-4 to a denominator of 16-a^2

Adecibel is a logarithmic unit that can be used to measure the intensity of a sound. the function y = 10logx gives the intensity of a sound in decibels, where x is the ratio of the intensity of the sound to a reference intensity. the reference intensity is generally set at the threshold of hearing. use the graphing utility to graph the decibel function.a whisper has a sound intensity of 30 decibels. use your graph to you complete the following statement. the sound intensity of a whisper is times the reference intensity.