Trigonometry class.

This is trigonometry.

This is trigonometry.

You've learned trigonometry.

And now you can use trigonometry.

Later on we'll learn, in trigonometry how trig functions are useful for any triangle.

When you actually take trigonometry as a class, you'll see that they have all these trig identities and all that.

And this is a 45 45 90 triangle.

But this is our trig identity.

When we start doing Trigonometry we'll use radiants.

little trigonometry or something like that.

And I was never allowed to take geometry or trig.

'Using trigonometry and algebra, Al Biruni used a formula

What trig function deals with it?

I had just taken trigonometry in high school,

I like to keep it in kind of the fundamental trig functions, or trig ratios as opposed to things like secant and cosecant.

In this video I wanna give you the basics of Trigonometry.

So what trig function deals with opposite and hypotenuse?

This is difficult, maybe some type of trig function.

And then we can use this trigonometric identity.

And we'll use the same trig identities we did before.

Everything in trigonometry really does boil down to SOHCAHTOA.

And where I was bad was algebra. And I was never allowed to take geometry or trig.

In mathematics, he had many important writings on trigonometry, which were developed from the writings of Ptolemy.

And now we could use a little bit about what we know about trigonometry.

Well this is where your break out the trig or you brush off your memory.

So what trig function deals with the adjacent side and the hypotenuse.

And this one, just like previous problems, more than knowing your pre calculus or your calculus, you need to know your trig identities.

So that's the integral, and now to evaluate it, we're going to have to break out some trigonometry.

And now I'll just do the basic trig functions, and you should memorize these as well.

Because that's a very useful limit to know later on when we take the derivatives of trig functions.

And we could do it if we were creative with our geometry and our trigonometry.

Now there's one last or two last things that I want to introduce in this video is there are special words.

And if you know your trig identities, that equals 1 over cosine squared of x.

That's going to be useful for you on the SAT, that's going to be useful for you when you take trigonometry.

Trigonometric

Gigantic mistake I'm finding a lot of kids who need to skip algebra, go right to geometry and trig.

But by recognizing the trig identity, we were able to simplify it to an ellipse, draw the ellipse.

Trigonometry told him that the angle he had measured and the height of the mountain are related to the radius of the Earth, and algebra allowed him to calculate it.

At least it shows you that you didn't memorize your trig identities for nothing.

I'm finding a lot of kids who need to skip algebra, go right to geometry and trig.

I'll have to break out some serious geometry and trigonometry to figure out what happens to 1, 0 when I reflect around the line spanned by 1, 2.

All right, and just so you know, congruent triangles are triangles that are the same in every way, except they might have been rotated.

Why use triangles?

I had just taken trigonometry in high school, I learned about the parabola and how it could concentrate rays of light to a single focus.