### Precalculus for technology is depicted.

7.4 #20 use an identity to write each expression as a single trigonometric function value or as a single number. 1-2sin^2(22)(1/2degree) #30 express each function as a trigonometric function of x. cos 3x #56 write each expression as a sum or difference of trigonometric functions. 8 sin 7x sin 9x #58 write each expression