1 + tan²x = sec²x (1 + tan²x = sec²x)
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1 + tan²x = sec²x
What each symbol means
| Symbol | What it stands for |
|---|---|
| x | Angle where cos x ≠ 0 (x ≠ odd multiple of π/2) |
When to use this
x ≠ (2n+1)π/2. Derived by dividing sin²x+cos²x=1 by cos²x.