Consider the following formulas a sin 80 b cos B0 b sin 80 C where C arctan b a and a 0 a sin B0 b cos 80 b cos B0 C where C arctan a b and b 0 a Use the formulas given above to write the trigonometric expression in the following forms Round each C to four decimal place 6 sin 80 8 cos 80 a b a b sin 80 C 2 6 cos B0 3