Tangent repeats every 180 degrees, so Tan(180 + a) = tan(a). This site has several useful identities.
http://www.mathwords.com/t/trig_identities.htm
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8 x 180 = 1,440
180 plus 124 = 304
sin(180) = 0 cos(180) = -1 tan(180) = 0 cosec(180) is not defined sec(180) = -1 cot(180) is not defined.
150
This is addtion. These numbers added to gether will give you 1050.