SOLUTION: prove that left side equation is equal to the right side
1+cosx/1-cosx + 1-sinx/1+sinx = 2(sinx + secx)/tanx-sinx+secx
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Trigonometry-basics
-> SOLUTION: prove that left side equation is equal to the right side
1+cosx/1-cosx + 1-sinx/1+sinx = 2(sinx + secx)/tanx-sinx+secx
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