Cos Definition and 317 Threads

the question is: find the exact value of tan 285 deg + cos 75 deg + cot 60 deg i tried converting them to radians and got tan 5pi / 12 + cos 5 pi / 12 + cot pi / 3 by "exact value", the question means fractions, not decimals. as far as i know, only the cot part has some special...

sin cos problem finding exact value... I have to find the exact value of : \frac {\sin^2 45 degrees + \cos ^2 45 degrees} {\sin 60 degrees \cos 30 degrees} The squares are throwing me off , without them I got \frac {\frac {1} {sqrt2} + \frac {1} {sqrt2}} {3/2} what do I do with the...

Hi, I'm programming a game and need a character to turn facing another character. I got far but the problem is the language(Turing) Iam provided with doesn't support a cos/sin inverse function but has sin/cos. Anyone know the formula? I have cos(x) how can I get x? Searching on google is...

doing a problem but can't figure out the answer: Given the following, evaluate csc(theta): cos(theta) = 1/2 tan(theta) = negative a> 2 b> -2(square root of)3/3 c> 2(square root of)3/3 d> -2 any help?

How do I solve these two: cos 2v = cos v sin 2v = sin v

How can I proof the identity e^ix = cos x + i sin x?

Can someone please help me with this one? cos2x = 2 cos x sin x I need to find 4 angles :rolleyes:

Assume you are given tan (pi/6). This means sin (pi/6)/cos (pi/6). But my question is, if you are given sin (pi/6) or cos (pi/6), is it possible to derive the numerical value without using calculator? -Thank you in advance.

How do I do this? Thanks.

I don't understand how they figure these problems out. Give the quadrant in which each of the following points are located, and determine which of the functions are postive and which are negative. (4, 3) Quadrant I; SIN +; COS +; TAN +; CSC +; SEC +; COT +; I understand that I think...

problem: Simplify F(x) = 1 / ( 1+tan^2 x)^.5 - cos x :0<x<pi/2 ok the only thing i can think of to substitute in was (1+tan^2 x)^.5 = sec^2 x ... so i got the problem down to 1 / (sec^2 x)^.5 + cos and then become stucks i m thinken i can just say it is...

I had a question on a math test which said that you should find an approximation for e^x which is very good for x \approx 0 . First I declared the function f(x) = e^x . We have the interesting thing that f(x) = f'(x) = f''(x) = f'''(x) \ldots \ \forall x . And because of this we have f(0)...

i can't work out how to do this question, i have the answer, i just don't know how to get it Q. differentiate y = sin (cos x) A. - cos (cos) sin x If anyone could show me the solution, it would be greatly appreciated.

Yes it is me again. :D Now with a trig problem XD I was doing some problems on my homework in math, Trigonometry and I had problems proving this proof: 1+ cos Ө = csc Ө + cot Ө I've worked it out until I simplified the right side to: sin Ө ----- 1+ cos Ө And then I realized...

Find Laplace Transform of... (e^t + 2t^4 - cos (4t) + 10) Thank you

I just spent the last half hour trying to find my error in a problem. I checked my physics, my calculations, everything looked fine. It ended up being the simplest mistake I could make. I used Sin instead of Cos for a triangle. What a waste of time, it's the simplest mistakes you have to watch...

sin hx, cos hx, tan h x... What are they? What does the "h" mean here? Any explanations or websites would be appreciated. :smile: