Sin, Cos and Tan
This is the basics of using sine, co-sine and tangent for a right angled triangle. To do this you’ll probably need a scientific calculator
To perform calculations we are going to use the triangle above.
The three main relationships are:
Tan(x) = o/a
Sin(x) = o/h
Cos(x) = a/h
so if h = 5 and x = 30
a = Cos(30)h = 4.330
We can also use a inverse of the functions
ie) x = tan-1(o/a)
x = sin-1(o/h)
x = cos-1(a/h)
so if o = 5 and a = 10
x = tan-1(5/10) = 26.565
Using this information we can work out any side or angle in a right angled triangle as long as we have to other pieces of information (like a side and a angle or 2 sides). This is used a lot in resolving forces in physics and allows us to derive some other more complex equations.
Comments Left
Hello, I am still trying to make sense of this. I have looked through weveral sites and think the format you have to start will be understandable for me. I will reaccess this when i have more time. Thanks, I am looking forward to becoming math competent!
thanks for putting this up. I already understand it in geometry, but we are ready to take our sols so I had to re-remember it!
this is very useful.
thank you.
Thanks for putting this information up, I have read a lot of math but hasen´t used any in a long time. So this just what I needed to rember how cos, sin and tan works. Thanks
Thanks, was looking for this.
wtf
thank you so much.!
you know me bella, i cant understand math very well.
thanks
Sorry, my stupif lil bro said that. Awesome site! Thanks for all the tips, really helped me understand how Sin Cos and Tan work again. Very useful!!!
thanks so uch my math teacher SUCKS, he doesn’t explain it right.
Whether the trig identity (sinx)^2+(cosx)^2=1 only can be created using a triangle?
Nadya, you need to complete your question, whether the trig identity holds only for a right angled triangle. If not, can this forum gives other example the proof of (sinx)^2+(cosx)^2=1 without using pythagoras formula for the triangle?Thx.
this is al so confusing lol
i still dont understand
Thanks heaps, I do physics but not maths so I don’t get this stuff. Figures…
@Oliver
Thanks for visiting glad I could help