Principal Value of tan⁻¹(√3) − sec⁻¹(−2)

Evaluate: tan-1(√3) − sec-1(−2)

Solution:

Step 1: Evaluate tan⁻¹(√3)

\[ \tan^{-1}(\sqrt{3}) = \frac{\pi}{3} \]

(Since principal range of tan-1(x) is \((- \pi/2, \pi/2)\))

Step 2: Evaluate sec⁻¹(−2)

\[ \sec^{-1}(-2) = \frac{2\pi}{3} \]

(Using identity: sec-1(−x) = π − sec-1(x), and sec-1(2) = π/3)

Step 3: Subtract

\[ \frac{\pi}{3} – \frac{2\pi}{3} = -\frac{\pi}{3} \]

Final Answer:

Value = \[ -\frac{\pi}{3} \]

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