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# What does cosine mean?

The cosine function is one of the three basic functions used in trigonometry. The cosine of a right triangle is found by taking the ratio of the length of the triangle's adjacent side over the length of the hypotenuse. In other words, divide them.

Continue ReadingThe cosine is often used in conjunction with the other basic trigonometry functions, which are the sine and the tangent. A common mnemonic makes it easier to remember the definitions and formulas of the cosine, the sine and the tangent. The mnemonic is SOHCAHTOA, which means Sine equals Opposite over Hypotenuse, Cosine equals Adjacent over Hypotenuse, Tangent equals Opposite over Adjacent.

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## What are some common antiderivatives of trig functions?

A: The antiderivative of the cosine function is sin x + c, and the antiderivative of the sine function is -cos x + c. The antiderivative of the tangent functi... Full Answer >Filed Under: -
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## What is the integral of tan(x)?

A: The integral of tan(x) is -ln |cos x| + C. In this equation, ln indicates the function for a natural logarithm, while cos is the function cosine, and C is ... Full Answer >Filed Under: -
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## How do you find the derivative of sin2x?

A: To find the derivative of a sin(2x) function, you must be familiar with derivatives of trigonometric functions and the chain rule for finding derivatives. ... Full Answer >Filed Under: -
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## When was trigonometry invented?

A: Ancient Egyptian and Greek philosophers used an early form of trigonometry that involved calculating chords to obtain the angles of a triangle. This method... Full Answer >Filed Under: