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Identities
Question | Answer |
---|---|
Cos (A+B) | cosAcosB-sinAsinB |
Cos (A-B) | cosAcosB+sinAsinB |
Sin (A+B) | sinAcosB+cosAsinB |
Sin (A-B) | sinAcosB-cosAsinB |
Tan (A+B) | tanA+tanB/1-tanAtanB |
Tan (A-B) | tanA-tanB/1+tanAtanB |
Sin (2A) | 2sinAcosA |
Cos (2A) | cos^2A-sin^2A 2cos^2A-1 1-2sin^2A |
Tan (2A) | 2tanA/1-tan^2A |
Sin A/2 | ±√1-cosA/2 |
Cos A/2 | ±√1+cosA/2 |
Tan A/2 | sinA/1+cosA ±√1-cosA/1+cosA 1-cosA/sinA |
cos^2A+sin^2A= | 1 |
cot^2A+1= | csc^2A |
1+tan^2A= | sec^2 |