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Because the cosine of some angles is positive and

the cosine of some other angles is negative.

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Q: Why are cosines positive and negative?
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Related questions

Why is cosine 16 negative?

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.


Is a positive plus a negative make a positive or a negative?

Positive + Negative = Negative Negative + Negative = Positive Positive + Positive = Positive Negative + Positive = Negative


What is a negative - positive?

Negative * positive = negative Positive * positive = positive Negative * negative = positive


How is dividing integers similar to multiplying integers with the resulting sign?

The rules for the sign (positive or negative) of the result of a multiplication is the same as division. For multiplication: Positive * Positive --> Positive Positive * Negative --> Negative Negative * Positive --> Negative Negative * Negative --> Positive For division: Positive / Positive --> Positive Positive / Negative --> Negative Negative / Positive --> Negative Negative / Negative --> Positive


If a negative is divided by a positive is it negative?

Yes. Negative/negative = positive Postive/Positive = positive Negative/Positive - negative


When multiplying numbers what do you do with the positive and negative signs?

Negative * positive = negative Positive * positive = positive Negative * negative = positive


When you divided a negative number by a positive number witth the answer be positive or negative?

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.


Negative plus a positive?

Negatives and Positives Positive + Positive = Positive Negative + Negative = Positive Negative + Positive = Negative Positive + Negative = Negative


How are multiplying integers and dividing integers alike?

a negative x a negative= a positive, a positive x a positive= a positive, a negative x a positive= a negative, and a positive x a negative= a negative. Same thing with division. a negative divided by a negative= a positive, a positive divided by a positive= a positive, a negative divided by a positive= a negative, and a positive divided by a negative is a negative. U see?


What does a positive and a neagive equal?

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.


What is a negative multiplied by a negative?

negative*negative=positive negative/positive=negative negative\negative=positve negative-positive=change the sign to a plus and then change the number after the sign and get your answer negative +positive=which ever numbr is bigger minus positive+positive=positive


Negative times a positive equals?

positive times negative equals negative. positive times positive equals positive. negative times negative equals positive