SOLUTION: Find ALL REAL solutions to the following equation: {{{0=cos(9/2)pi+5x}}} A) {{{x=(1/3)pi+(2/3)pi*Z}}} , {{{x=(2/3)pi*Z}}} B) {{{x=(-1/12)pi+(1/3)pi*Z}}} , {{{x=(1/12)pi+(1/3)pi*

Algebra ->  Trigonometry-basics -> SOLUTION: Find ALL REAL solutions to the following equation: {{{0=cos(9/2)pi+5x}}} A) {{{x=(1/3)pi+(2/3)pi*Z}}} , {{{x=(2/3)pi*Z}}} B) {{{x=(-1/12)pi+(1/3)pi*Z}}} , {{{x=(1/12)pi+(1/3)pi*      Log On


   

Question 1151671: Find ALL REAL solutions to the following equation:
0=cos%289%2F2%29pi%2B5x
A) x=%281%2F3%29pi%2B%282%2F3%29pi%2AZ , x=%282%2F3%29pi%2AZ
B) x=%28-1%2F12%29pi%2B%281%2F3%29pi%2AZ , x=%281%2F12%29pi%2B%281%2F3%29pi%2AZ
C) x=%281%2F5%29pi%2B%282%2F5%29pi%2AZ , x=%282%2F5%29pi%2AZ
D) none of these
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!
0=cos%289%2F2%29pi%2B5x++
5x=-cos%289%2F2%29pi
x=-%281%2F5%29cos%289%2F2%29pi
x=-%281%2F5%29%2A%28-0.21079579943%29%2A3.14
(decimal:x=0.1324)

answer:
D) none of these