please solve it........
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tan(a+b)=tan a +tan b /1-tan a tan b
tan (1/3 + 1/2)= tan 1/3 +tan 1/2 /1- tan 1/3 tan 1/2
tan 39.80=18.43+26.56/-488.72
tan 39.80=44.99/-488.72
tan 39.80= -0.09
tan = 39.80/-0.09
tan = -442.22
= tan -1(442)
= 89.87
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