Trigonometric Identities & Formulas

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Can you name the Trigonometric Identities & Formulas?

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1/sin x =
IDENTITIES: Reciprocal  
1/cosx =
Reciprocal  
1/tan x =
Reciprocal  
sin^2 x + cos^2 x =
Pythagorean  
tan^2 x + 1 =
Pythagorean  
cot^ x + 1 =
Pythagorean  
sin (π/2 – x) =
Cofunction  
tan (π/2 – x) =
Cofunction  
csc (π/2 – x) =
Cofunction  
sin (–x) =
Even/Odd  
cos (–x) =
Even/Odd  
tan (–x) =
Even/Odd  
csc (–x) =
Even/Odd  
sec (–x) =
Even/Odd  
cot (–x) =
Even/Odd  
sin (x + y) =
FORMULAS: Sum  
sin (x – y) =
Difference  
cos (x + y) =
Sum  
cos (x – y) =
Difference  
tan (x + y) =
Sum  
tan (x – y) =
Difference  
sin 2x =
Double Angle  
Double Angle in any order: cos 2x =
(1) 
(2) 
(3) 
tan 2x =
Double Angle  
sin^2 x =
Power Reducing  
cos^2 x =
Power Reducing  

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