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trig equation: find value of x in cos(3x)= -0.419 for 0<x<  TOPIC_SOLVED

find the value of x cos(3x)= -0.419 for 0<x<270 I do arc cos -0.419 which equals 114.77 and then to find the second angle in the 3rd quadrant why do I need to minus 360 to get the degree in the 3rd quadrant? why not add 90 to 114.77 to make it in the 3rd quadrant? someone please explain this
by zack
on Wed Feb 08, 2012 9:05 pm
 
Forum: Trigonometry
Topic: trig equation: find value of x in cos(3x)= -0.419 for 0<x<
Replies: 1
Views: 1598

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