cos and sin

[jonos]

i have seen these used a lot, and if its not too much trouble, could someone please explain these and what they do. im only starting grade 10 math, so i don't know.

[Paul]

They're used in trig, you can use them in solving for parts of a triangle if certain other parts are known. I think only in right angeled triangles:
sin(angle) = opposite / hypotenuse
cos(angle) = adjacent / hypotenuse
haven't reached that unit yet, remebered from some book 2 summers back... that I was made to study...

[Tony]

Sin/Cos/Tan are ratios formed between the sides of the triangle in relation to an angle. If you know an angle and 1 side, you can find all other sides using trig.

Sin/Cos/Tan functions are applied to the right angle triangle, but you can use special ratios in any triangle.

a^2 = b^2 + c^2 - 2bc CosA

where a,b,c are the sides and A is the angle opposite of the side a

also

SinA/a = SinB/b = SinC/b

[jonos]

thanks for explaining it, but is there any where where i could get a more simpler definition/use

[Tony]

grade 10 math textbook

[shorthair]

its hte final unit in math , it makes the course relaxing after quadratices, good way to end hte year / semester ... trignometry is fun and good for programming

[Tony]

trig is neccessary for programming

lol, quadratics... that's the easy stuff... just wait till calculus

[shorthair]

in in funtions and relations right now , caculus isnt that dificult ( begginers 0 i was looking at it online couple weeks ago the coursse in grade 12 dosent go very indepth

[Tony]

well at first its advanced functions... you don't get into the real calculus for a while...

but apparently its really useful in physics pass highschool

[Catalyst]

calculus isnt that hard (it still is fairly hard tho)

[shorthair]

i quite like functions , i love number secuences aswell in math , the fibionacci geometric and arithmeic i have found very useful

[octopi]

Calculus was hard.
Algebra is hard.

I love both of them
Data Management is a boring pain in the neck.

[Catalyst]

well said

[AsianSensation]

octopi wrote:

Data Management is a boring pain in the neck.

that's why you take it in gr 11 so you won't be bored as much as you would in gr 12. But's Finite is a good course to take, very useful in solving problems. Yeah, I know, with computer science, you could just write up a program and do a probability question by repeatedly running that program, but the matrices and probablity theory you learn is not bad at all, and very very useful.

[apomb]

I was wondering if Geometry/Discrete Math is useful for programming ... and if it is / not ... what does it teach you ?