sin^2a
_______ + cosa
1+cosa
sin^2a sin^2a+cosa(1+cosa) sin^2a+cosa+cos^2a 1+cosa
_______ + cosa= __________________ = ___________________ = _________ =1
1+cosa 1+cosa 1+cosa 1+cosa
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sin^2a sin^2a+cosa(1+cosa) sin^2a+cosa+cos^2a 1+cosa
_______ + cosa= __________________ = ___________________ = _________ =1
1+cosa 1+cosa 1+cosa 1+cosa