Rewrite this expression using a double angle formula to end with an expression in the form a cos bx , where a and b are integer values : 8cos2 (7x) - 4

Me answer number 3plz explain how you do it

Two lines that do not intersect are skew. always sometimes or never

Kapil needed to buy a long wooden beam. he went to two sawmills that each charge an initial fee plus an additional fee for each meter of wood. the following equation gives the price (in dollars) of a wooden beam from the first sawmill as a function of its length (in meters). p = 5+20xp=5+20x