The values of x over the interval 0° < x < 180° for which cos(3x) = 1 are

The solution is x = 120º

This question is the solution of a trigonometric equation, involving cosine.

-----------------------------

Standard equation:

has the solutions given by:

In which n = 0, 1, 2,...

Considering that , the solution, in degrees, is:

-----------------------------

In this question:

Thus, a = 3, and the solution is:

We want solutions greater than 0º and less than 180º, so the solution is x = 120º.

A similar example is found at link

n

step-by-step explanation:

#15. square

step-by-step explanation:

because quadrilatural (idk how to spell it) means somthing that is not 3d or like, equal sides (or somthing like that   you know what i meanz)

hope this halps!

bai!