Double Angle Set identity (sin2A=2sinAcosA;cos2A=cos^2A-sin^2A=2cos^2A-1=1-2sin^2A;tan2A=frac2tanA1)
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sin 2A=2sin Acos A; cos 2A=cos^2A-sin^2A=2cos^2A-1=1-2sin^2A; tan 2A=frac2tan A1
What each symbol means
| Symbol | What it stands for |
|---|---|
| A, B, x, a, b | As in standard NCERT treatment; domain restrictions apply for tan. |
When to use this
Standard NCERT conditions; tan identities exclude odd multiples of π/2 where undefined.