Trigonometry & Inverse Trigonometry
Inverse Trigonometric Equations
Grade 11

Question:

<p>If 2 tan<sup>-1</sup>(1/5) - sin<sup>-1</sup>(3/5) = -cos<sup>-1</sup>(9<i>l</i>/65), then <i>l</i> =</p>

Step-by-Step Solution

Key Concept: Apply inverse trigonometric function properties and solve for the unknown parameter.
<p>Answer: 7</p>
Correct Answer: 7

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