1/cta+cosa/1+sina=1/cosa/sina+ cosa/1+sina=sia/cosa+cosa/1+sina=sina+sin^2a+cos^2a/(1+sina)cosa=sina+1/(1+sina)cosa=1/cosa
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1/cta+cosa/1+sina=1/cosa/sina+ cosa/1+sina=sia/cosa+cosa/1+sina=sina+sin^2a+cos^2a/(1+sina)cosa=sina+1/(1+sina)cosa=1/cosa