Because the cosine of some angles is positive and
the cosine of some other angles is negative.
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First of all, I can't tell what angle you're talking about, because you failedto mention the unit of your angle.-- Cosine of 16 degrees is roughly 0.9613 ... a positive number.-- Cosine of 16 radians is roughly -0.9577 ... a negative number.-- Cosine of 16 grads is roughly 0.9686 ... a positive number.Over any reasonably large range of angles, half of them have positive cosines,and the other half of them have negative cosines.
Negative * positive = negative Positive * positive = positive Negative * negative = positive
Negative * positive = negative Positive * positive = positive Negative * negative = positive
A negative divided by a positive is negative. A negative divided by a negative is positive. A positive divided by a positive is positive. A positive divided by a negative is negative.
positive and a positive is a positive negative and a negative is a positive to answer your question: positive and a negative is a negative.