求证:1+tan^2=1/cos^2

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求证:1+tan^2=1/cos^2求证:1+tan^2=1/cos^2求证:1+tan^2=1/cos^21+tan^2=1+sin^2/cos^2=(cos^2+sin^2)/cos^2=1/co

求证:1+tan^2=1/cos^2
求证:1+tan^2=1/cos^2

求证:1+tan^2=1/cos^2
1+tan^2=1+sin^2/cos^2=(cos^2+sin^2)/cos^2=1/cos^2

1++tan^2=sec^2
sec^2=1/cos^2