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Evaluation Equations & Inequalities for Trig Functions/Graph  TOPIC_SOLVED

Hello! I'm new to the board and am stuck on these types of questions: Referring to a graph of y = sin x or y = cos x find the exact values of x in the interval [0, 4pi] that satisfy the equation: sin x = 1/2 I know that I am looking for the values of x where the graph of sin x intersects graph of th...
by hiroze
on Fri Apr 16, 2010 10:56 pm
 
Forum: Trigonometry
Topic: Evaluation Equations & Inequalities for Trig Functions/Graph
Replies: 7
Views: 7668

Re: Evaluation Equations & Inequalities for Trig Functions/G  TOPIC_SOLVED

Hmmm. I'm not sure what you mean. The answers are pi/6, 5pi/6, 13pi/6, 17pi/6.
by hiroze
on Fri Apr 16, 2010 11:58 pm
 
Forum: Trigonometry
Topic: Evaluation Equations & Inequalities for Trig Functions/Graph
Replies: 7
Views: 7668

Re: Evaluation Equations & Inequalities for Trig Functions/G  TOPIC_SOLVED

Part of the problem is that since I've never had a trig class, I don't know what I am suppose to memorize and what I am suppose to be able to derive, which is only important since tests are timed, but I've made a point to memorize the reference angles and make sure I can derive them. But anyway, aft...
by hiroze
on Sat Apr 17, 2010 7:38 pm
 
Forum: Trigonometry
Topic: Evaluation Equations & Inequalities for Trig Functions/Graph
Replies: 7
Views: 7668

Re:  TOPIC_SOLVED

You're exactly right about the height. You look at the graph and, knowing that sin(x) = 1/2 for x = pi/6 (or for x = 30 degrees; take your pick), you look for the places where the graph looks to be about right for the height. Then you add or subtract 30 degrees (or pi/6) from the closest known angl...
by hiroze
on Sat Apr 17, 2010 11:47 pm
 
Forum: Trigonometry
Topic: Evaluation Equations & Inequalities for Trig Functions/Graph
Replies: 7
Views: 7668

Reference Angle Section Question  TOPIC_SOLVED

This question is in the exercises associated with reference angles. I understand the reference angle part, but there is a question, which I don't know how to work with or without a calculator. Approximate to three decimal places: a) sin 73deg 20' b) cos 0.68 The answers are a) .958 and b) .778 thoug...
by hiroze
on Sat Apr 17, 2010 11:50 pm
 
Forum: Trigonometry
Topic: Reference Angle Section Question
Replies: 1
Views: 2793

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