因为 tan^2b=sin^2b/1-sin^2b 所以sin^2b=tan^2b/1+ tan^2b 为什么sin^2b=tan^2b/1+ tan^2b?

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因为tan^2b=sin^2b/1-sin^2b所以sin^2b=tan^2b/1+tan^2b为什么sin^2b=tan^2b/1+tan^2b?因为tan^2b=sin^2b/1-sin^2b所以

因为 tan^2b=sin^2b/1-sin^2b 所以sin^2b=tan^2b/1+ tan^2b 为什么sin^2b=tan^2b/1+ tan^2b?
因为 tan^2b=sin^2b/1-sin^2b 所以sin^2b=tan^2b/1+ tan^2b 为什么sin^2b=tan^2b/1+ tan^2b?

因为 tan^2b=sin^2b/1-sin^2b 所以sin^2b=tan^2b/1+ tan^2b 为什么sin^2b=tan^2b/1+ tan^2b?
∵tan^2b=sin^2b/1-sin^2b
∴tan²b-tan²bsin²b=sin²b
∴tan²b=tan²bsin²b+sin²b
∴(1+tan²b)sin²b=tan²b
∴sin²b=tan²b/(1+tan²b)