# Math Homework need answers please help trig problems
**URL:** https://boards.straightdope.com/t/math-homework-need-answers-please-help-trig-problems/656629
**Category:** Factual Questions
**Created:** [April 24, 2013, 11:14pm UTC](https://boards.straightdope.com/t/math-homework-need-answers-please-help-trig-problems/656629 "2013-04-24T23:14:35Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Sokka](https://boards.straightdope.com/u/Sokka)
#### Post date: [April 24, 2013, 11:14pm UTC](https://boards.straightdope.com/t/math-homework-need-answers-please-help-trig-problems/656629/1 "2013-04-24T23:14:35Z")
Sum/difference trig problems please help urgent?
1.cos(345)
2.sin(405)
3.sin(10pi/24)
4.tan(-105)
Additional Details
answer has to be in rads please like 2pi/4
True or false trig problem please help easy 10pts?
b.sinx = -√3/2 x=pi/6
c.cosx= 1/2 x=7pi/6
d.tanx= √3 x=pi/6
e.cotx= -1 x=3pi/4
f.secx= -2 x=4pi/3
Solve the equation of the interval [0,2pi) please help trig?
a.sinx=1/2
b.(sinx+1)(cosx-1)=0
c.(2cosx-1)(sinx-1)=0
d.cosx= -√3/2
e.tanx= -1
Use the given information to calculate the exact value of the expression please help trig problem?
I got half of the first part do but cant find answer please help.
1. cosx=-√429/25 cosy=3/5 sinx=14/25 siny=4/5
a. find cos(x+y) b. find tan(x-y) c. find sin(x-y)
number 6 isnt halfway done.
1. cos a=-12/16 pi/2 ≤ a ≤ pi and sin b= 6/8 pi ≤ 6 ≤ -3pi/2
a. find sin(a-b) b. find cot(a+b) c. find cos(a-b)
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### Author:  [@Joey\_P](https://boards.straightdope.com/u/Joey_P)
#### Post date: [April 24, 2013, 11:17pm UTC](https://boards.straightdope.com/t/math-homework-need-answers-please-help-trig-problems/656629/2 "2013-04-24T23:17:28Z")
3…
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### Author:  [@Chronos](https://boards.straightdope.com/u/Chronos)
#### Post date: [April 24, 2013, 11:28pm UTC](https://boards.straightdope.com/t/math-homework-need-answers-please-help-trig-problems/656629/3 "2013-04-24T23:28:00Z")
> [@](#):
>
> Sum/difference trig problems please help urgent?
> 1.cos(345)
> 2.sin(405)
> 3.sin(10pi/24)
> 4.tan(-105)
>
> Additional Details
> answer has to be in rads please like 2pi/4
You have somehow misinterpreted the nature of the problems, since “answer must be in rads” doesn’t make sense for the problems you’ve given. How and why it doesn’t make sense is left as an exercise for the student.
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### Author:  [@Great\_Antibob](https://boards.straightdope.com/u/Great_Antibob)
#### Post date: [April 24, 2013, 11:28pm UTC](https://boards.straightdope.com/t/math-homework-need-answers-please-help-trig-problems/656629/4 "2013-04-24T23:28:23Z")
Please check the [rules](http://boards.straightdope.com/sdmb/showthread.php?t=466202) for General Questions, specifically the prohibition against asking for homework help.
If you have a general question on how trig works or a specific question on the hows or whys of a particular trigonometric identity, there are plenty of people willing to help with that.
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### Author:  [@Angel\_of\_the\_Lord](https://boards.straightdope.com/u/Angel_of_the_Lord)
#### Post date: [April 24, 2013, 11:33pm UTC](https://boards.straightdope.com/t/math-homework-need-answers-please-help-trig-problems/656629/5 "2013-04-24T23:33:55Z")
[https://www.khanacademy.org/math/trigonometry/basic-trigonometry/radians\_tutorial/v/radians-and-degrees](https://www.khanacademy.org/math/trigonometry/basic-trigonometry/radians_tutorial/v/radians-and-degrees)
This (and the other videos) will give you all the answers. Eventually.
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### Author:  [@Colibri](https://boards.straightdope.com/u/Colibri)
#### Post date: [April 25, 2013, 3:01am UTC](https://boards.straightdope.com/t/math-homework-need-answers-please-help-trig-problems/656629/6 "2013-04-25T03:01:10Z")
> [@Great\_Antibob](#):
>
> Please check the [rules](http://boards.straightdope.com/sdmb/showthread.php?t=466202) for General Questions, specifically the prohibition against asking for homework help.
>
> If you have a general question on how trig works or a specific question on the hows or whys of a particular trigonometric identity, there are plenty of people willing to help with that.
Correct. This is closed.
You may open another thread to ask about aspects of the questions you don’t understand, but don’t ask other people to just do your homework problems for you.
Colibri
General Questions Moderator