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sin¦È+sin¦Õ = 2sin[(¦È+¦Õ)/2]cos[(¦È-¦Õ)/2] sin¦È-sin¦Õ = 2cos[(¦È+¦Õ)/2]sin[(¦È-¦Õ)/2] cos¦È+cos¦Õ = 2cos[(¦È+¦Õ)/2]cos[(¦È-¦Õ)/2] cos¦È-cos¦Õ = -2sin[(¦È+¦Õ)/2]sin[(¦È-¦Õ)/2]

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sin¦Ásin¦Â = -1/2*[cos(¦Á+¦Â)-cos(¦Á-¦Â)] cos¦Ácos¦Â = 1/2*[cos(¦Á+¦Â)+cos(¦Á-¦Â)] sin¦Ácos¦Â = 1/2*[sin(¦Á+¦Â)+sin(¦Á-¦Â)] cos¦Ásin¦Â = 1/2*[sin(¦Á+¦Â)-sin(¦Á-¦Â)] [±à¼­±¾¶Î]ÓÕµ¼¹«Ê½ sin(-a) = -sin(a) cos(-a) = cos(a) sin(¦Ð/2-a) = cos(a) cos(¦Ð/2-a) = sin(a) sin(¦Ð/2+a) = cos(a) cos(¦Ð/2+a) = -sin(a) sin(¦Ð-a) = sin(a) cos(¦Ð-a) = -cos(a) sin(¦Ð+a) = -sin(a) cos(¦Ð+a) = -cos(a) tanA= sinA/cosA

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