PROVING TRIGO IDENTITIES
Ok. So we have arrived at the end of the chapter. I know it has been grueling and in many ways torturous (mainly due to the endless list of formulas and exercises we have trying to solve)…. But here we are FINALLY!!! *sign of relieve*
Hence, I have some good news and bad news… i shall start with the bad news, that way we can get it out our heads first. YOU HAVE TO REMEMBER ALL THE FORMULAS FOR THE WHOLE CHAPTER TO DO THIS SECTION…
If u just had a heart attack or have difficulty breathing, I suggest u take a sit IMMEDIATELY and take DEEP BREATHES.., ;) hehehe…
Now for some GOOD NEWS, the formulas you have WORKED SO HARD to cram in your heads can FINALLY be put to some GOOD USE in this part of the chapter. *YAY*
With that aside, I think it is important that I list out a few CRUCIAL identities that may come in handy when trying to prove other trigo identities in this section…
Reciprocal identities 
Pythagorean Identities
Quotient Identities
Co-Function Identities
Sum-Difference Formulas
Double Angle Formulas
Power-Reducing/Half Angle Formulas
Taken from: http://www.sosmath.com/trig/Trig5/trig5/trig5.html
There it is all listed out for u guys… hehehe…. LOOKS a lot I know... But remember:
DON’T STOP BELIEVING!!!
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