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DedPeter [7]
3 years ago
6

(secA+cosA)(secA-cosA)=tan^2A+sin^2A

Mathematics
1 answer:
vlabodo [156]3 years ago
8 0

(\sec A+\cos A)(\sec A-\cos A)=\sec^2A-\cos^2A

\sec^2A-\cos^2A=(1+\tan^2A)-(1-\sin^2A)

(1+\tan^2A)-(1-\sin^2A)=\tan^2A+\sin^2A

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