alleryThe identity sec2 A minus tan2 A equals:
A0
B2
C3
D1
Answer & Solution
Correct answer: D. 1
1. Divide the first identity through by cos squared A.
2. That turns it into a relation between sec and tan.
3. The result is sec2 A minus tan2 A equals 1.
4. So the answer is 1.
_Source: syllabus Mathematics, Ch 8 'Introduction to Trigonometry'_
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