Verify: (cosx/1 + sinx) + (cosx/1-sinx) = 2secx

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(cosx/1 + sinx) + (cosx/1-sinx)=

(cosx(1-sinx)+cosx(1+sinx))/(1-sin^2x)=

(cosx-sinxcosx+cosx+sinxcosx)/cos^2x=

2cosx/cos^2x=

2/cosx=

2secx=2secx

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