求证cos^3a(1+tana)+sin^3a(1+1/tana)=sina+cosa

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求证cos^3a(1+tana)+sin^3a(1+1/tana)=sina+cosa求证cos^3a(1+tana)+sin^3a(1+1/tana)=sina+cosa求证cos^3a(1+tan

求证cos^3a(1+tana)+sin^3a(1+1/tana)=sina+cosa
求证cos^3a(1+tana)+sin^3a(1+1/tana)=sina+cosa

求证cos^3a(1+tana)+sin^3a(1+1/tana)=sina+cosa