Prove that (secA-cosA)(secA +cosA)=sin^2+tan^2A
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12
Answer:
Step-by-step explanation:
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Answered by
10
Answer:
Step-by-step explanation:
(sec A - cos A)(sec A + cos A)
sec^2A - cos^2A
1 + tan^2A + sin^2A - 1
tan^2A + sin^2A
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