Start with these formulas Subtract So we get. It’s the same with these other formulas.

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Presentation transcript:

Start with these formulas Subtract So we get

It’s the same with these other formulas

We call these Product to Sum Formulas Use these when you have a product of trig functions and you want a sum.

Sum To Product Formulas Let and This simplifies to

Likewise we have

These formulas are great for solving some trig equations By making a sum into a product we can use the zero property when we solve.

WHY do we have so many formulas??? Blame the physicists These formulas have proven to be Useful in simplifying and solving problems

You’ll need to know these formulas for the final exam By learning them now you will know they they are there later (to look up)