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Because the cosine of some angles is positive and the cosine of some other angles is negative.
Look for a + by the positive terminal and a - by the negative terminal, or red for positive, black for negative. Some batteries have the positive terminal protruding and the negative terminal flat. Or you can get a meter that will tell you which is which,
Some are positive and some are negative.
Positive - you look great in uniform Negative - you may die in battle.
If you add a positive and a negative number, the result can be positive, negative, or zero - depending on which of the numbers has the greater absolute value. Here are some examples: 4 + (-4) = 0 (zero) 4 + (-6) = -2 (negative) 4 + (-2) = 2 (positive)