(secA+tanA)^2-(secA-tanA)^2=
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➻❥HᎾℙe it helps you...
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❁ ❁i❁t❁'❁s❁ ❁ ❁ ❁s❁m❁i❁l❁i❁n❁g❁ ❁c❁u❁t❁i❁e❁.......
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