trigonometric problem

Apr 8, 2016 at 10:10am
Hello. I need to solve this:
(cotg18*cotg12)/(sqrt(3))-(cotg18+cotg12)
Thank you in advance.
Apr 8, 2016 at 10:47am
Apr 8, 2016 at 11:43am
Hello. I need to solve this with trigonometric functions not result in approximation!
Apr 8, 2016 at 12:36pm
But it already uses trigonometric functions.
If you do it in C++ the result will be an approximation.

But if you did want to write it in C++, remember cot = 1/tan and angles are in radians rather than degrees.

Apr 8, 2016 at 1:00pm
Its not a C++ problem, its math problem. And I mean formulas. But thanks. I need the steps. The answer is:
sqrt(3)/3
I have the answer but I dont have the steps. I have been trying to solve this for four hours without luck.
Last edited on Apr 8, 2016 at 1:04pm
Apr 8, 2016 at 1:27pm
It's a long time since I solved any problem like this. But a couple of thoughts, anything involving trig functions and sqrt(3) makes me think in terms of angles like 60 degrees and 30 degrees.
example sin(60) = cos(30) = sqrt(3)/2

Now an interesting thing about the question is the angles 12 and 18. 12+18 = 30.
There are a lot of relationships between different trigonometric functions, expressing one in terms of the other and so on. I suggest you look up some of the formulae for those relationships (sorry, I don't remember them now).

http://www.sosmath.com/trig/Trig5/trig5/trig5.html

Last edited on Apr 8, 2016 at 1:30pm
Apr 8, 2016 at 1:41pm
Thank you. I will try again tomorrow.
Apr 9, 2016 at 8:26am
Can anyone help me?
Apr 9, 2016 at 4:57pm
I have solved the problem after eight hours.
Last edited on Apr 9, 2016 at 4:57pm
Apr 9, 2016 at 7:28pm
What does the g stand for in cotg?
Apr 10, 2016 at 4:35am
Maybe "cotangent of angle in gradians"?

As an aside, am I the only one who thinks the reciprocal trigonometric functions are just garbage?
Apr 10, 2016 at 6:55pm
All you need is sin
Apr 10, 2016 at 8:02pm
Wasn't that a Beatles number?
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