Update

Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है

Subjects
0 reads0 ratings0 helpful

What is the value of \(\sin^{-1}\left(\sin\left(-\frac{\pi}{4}\right)\right)\)?

Answer and explanation

Correct answer: -\(\frac{\pi}{4}\)

Direct answer: option A, \(-\frac\pi4\). First evaluate the inner value: \(\sin(-\frac\pi4)=-\frac{\sqrt2}{2}\). Now inverse sine asks for the principal angle having that sine. Because \(-\frac\pi4\) already lies in the principal range of \(\sin^{-1}x\), namely \([-\frac\pi2,\frac\pi2]\), the outer function returns the same angle: \(\sin^{-1}(\sin(-\frac\pi4))=-\frac\pi4\). A is correct. B changes the sign and has positive sine. C, \(-\frac{3\pi}4\), is outside the principal range. D is positive and also outside that range. The inverse function does not always cancel sine, but it does here because the original angle is in the required range. Memory cue: for sine, keep angles between -90° and 90° unchanged.

Related tags

Inverse Trigonometric FunctionsCompositionArcsin

Was this question useful?

No ratings yetWrite a review / Rate this question

Student Reviews

No published reviews yet.

Add Muft Shiksha to your Home Screen

In Safari, tap Share, then Add to Home Screen.