Prove that tan(a+b)=(tan(a)+tan(b))/(1-tan(a)tan(b)).More results on the video

In this video, we're gonna prove the some addition Or the addition for the sign and the cosine and the tangent. We will prove this formulas using the classical Behavior. We can use vectors or we can use a definition of the sign and the cosine and tangent. We're also going to prove the sign of a plus the sine of P Equals something and the cosine of a plus the cosine of V that's equal to something and after that we can approve the tangent of a plus the tangent of V. And we're going to prove that that's something To prove. All these results, we have to use the formulas that we have proved for the sign of a plus b. And the cosine of a plus b, and the tangent of a plus b. This formulas are very useful, especially when solving equations, Okay? Later, when we have to deal with equations, we're going to see that what we need. In fact is To be able to add and difference to make the difference. And for for, for design cosine, This is one way of proven this result. Okay, in our case, we're going to use the sum formula for the sign and the cosine and the tangent to prove all these formulas. We're going to see why we need them. Okay? Sometimes, when we want to solve equations like sine of x plus sine of 3x, okay? To solve this equation. We can write it as a product because when we write it as a product, it makes it will make it easy to solve. Okay? So next, we're going to do more videos, concerning numerical, analysis, topology, differential equations, algorithms and integrals, and all the geometry that we can need, okay? We get it. Add more complex and Analysis videos coming few weeks, okay? So be sure to be on time.
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