Class CBSE Class 12 Mathematics Inverse Trigonometric Functions Q #1333
KNOWLEDGE BASED
REMEMBER
2 Marks 2024 AISSCE(Board Exam) VSA
Find value of k if $sin^{-1}[k~tan(2~cos^{-1}\frac{\sqrt{3}}{2})]=\frac{\pi}{3}.$

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Detailed Solution

Step 1: Evaluate the innermost inverse trigonometric function

We are given the equation $sin^{-1}[k~tan(2~cos^{-1}\frac{\sqrt{3}}{2})]=\frac{\pi}{3}$. First, we evaluate $cos^{-1}\frac{\sqrt{3}}{2}$. Since $cos(\frac{\pi}{6}) = \frac{\sqrt{3}}{2}$, we have $cos^{-1}\frac{\sqrt{3}}{2} = \frac{\pi}{6}$.

Step 2: Evaluate the tangent function

Now we substitute this value into the equation: $sin^{-1}[k~tan(2 \cdot \frac{\pi}{6})] = \frac{\pi}{3}$ $sin^{-1}[k~tan(\frac{\pi}{3})] = \frac{\pi}{3}$ Since $tan(\frac{\pi}{3}) = \sqrt{3}$, we have $sin^{-1}[k\sqrt{3}] = \frac{\pi}{3}$

Step 3: Solve for k

Taking the sine of both sides, we get $sin(sin^{-1}[k\sqrt{3}]) = sin(\frac{\pi}{3})$ $k\sqrt{3} = \frac{\sqrt{3}}{2}$ Dividing both sides by $\sqrt{3}$, we get $k = \frac{1}{2}$

Final Answer: 1/2

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Pedagogical Audit
Bloom's Analysis: This is an REMEMBER question because it requires recalling trigonometric values and applying inverse trigonometric functions.
Knowledge Dimension: PROCEDURAL
Justification: The question requires the student to follow a specific procedure to evaluate the expression and find the value of k. This involves applying trigonometric identities and inverse trigonometric functions in a step-by-step manner.
Syllabus Audit: In the context of CBSE Class 12, this is classified as KNOWLEDGE. It directly tests knowledge of inverse trigonometric functions and trigonometric identities, which are core concepts in the syllabus.