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