2013 · Q47
What is (1−tan A)² + (1+tan A)² + (1−cot A)² + (1+cot A)² equal to?
Elementary MathematicsTrigonometry
- Asin²Acos²A
- Bsec²Acosec²A
- C2sec²Acosec²A
- DNone of the above
Explanation
= 4+2tan²+2cot² = 2sec²cosec². Answer C.
What is (1−tan A)² + (1+tan A)² + (1−cot A)² + (1+cot A)² equal to?
Explanation
= 4+2tan²+2cot² = 2sec²cosec². Answer C.