Question

can u tell me the formula of cosA.seca=?​

Answer 1

Answer:

SinA CosB = Sin (A + B) + Sin (A – B) CosA SinB = Sin (A + B) – Sin (A – B)

Step-by-step explanation:

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Answer 2

Answer:

Let’s see. We can start by writing it out, and then manipulating each side to make them equal.

I usually convert things to sin and cos just to make it more familiar.

Now you can reduce the fraction on the left.

Now you can manipulate to get a common denominator

Now that you have a common denominator, you can combine the fractions.

And now since you (should) know that , you can substitute that expression for 1, leaving you with:

And voila!

Though you should think about why you couldn’t figure this out.

Before asking about it, you should have at least tried some manipulations to see if you can get anywhere. That is the way you will learn the best. Try to solve problems yourself and struggle to see the solution.

Only if you have been going in circles constantly should you just ask for the solution. Doing this will cause you to be more creative and a better problem solver.

Or perhaps you were unaware of how equations like that can be proven. In that case, you have your answer: write out the equation and manipulate each side individually until you arrive at a true statement.

Step-by-step explanation:

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