Trignometric Identities

Reciprocal identities
displaymath161
Pythagorean Identities
displaymath162
Quotient Identities
displaymath163
Co-Function Identities
displaymath164
Even-Odd Identities
displaymath165
Sum-Difference Formulas
displaymath166
Double Angle Formulas
align99
Power-Reducing/Half Angle Formulas
displaymath167
Sum-to-Product Formulas
displaymath168
Product-to-Sum Formulas
displaymath169 
**ART 
If you do remember all of them good. But if you face any problems recalling them we have a trick.

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