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thanks

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In summary, the conversation involved finding the value of cos2t using the double angle formula. The problem provided a value for cot and asked to find the corresponding value for tan. The conversation also discussed using a calculator and finding the reference triangle to solve the problem. A helpful link was also provided for further understanding.

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thanks

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Can you give the entire problem?

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Jimmy Johnson said:Can you give the entire problem?

all that's given is that

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What is the question? What are you asked to find?

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what is =cos2xMostlyHarmless said:What is the question? What are you asked to find?

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its basically asking you to use the double angle formula

but I am not sure how to find those values

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you can find what tan is from cot

then i drew a triangle and got the hypot to be sqrt(41)

but how do i do that math

formula for cos2t = cos^2(t) - sin^2(t)

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Are you forbidden from using a calculator?

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Jimmy Johnson said:Are you forbidden from using a calculator?

teacher said u can use it

but need to know how to do it without one for test

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you have cot = -5/4, find what tan is then recall tan = sin/cos ... or recall cot = cos/sin...

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well i worked it out and i believe i got the answer to be 9/41

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That's what I'm getting

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You might find this link useful: http://www.mhhe.com/math/precalc/ba...tt01paga_s/ch06/downloads/pc/ch06section3.pdf

Trigonometric functions are mathematical functions that relate the angles of a triangle to the lengths of its sides. The most common trigonometric functions are sine, cosine, and tangent.

Trigonometric functions are used to solve problems involving angles and distances, such as in navigation, engineering, and physics. They also have applications in fields such as music and art.

The unit circle is a circle with a radius of 1 unit, centered at the origin on a graph. It is used in trigonometry to understand the relationship between angles and trigonometric functions. The coordinates of a point on the unit circle correspond to the sine and cosine values of the angle formed by that point with the x-axis.

You can use a calculator or a trigonometric table to find the values of trigonometric functions for a given angle. Alternatively, you can use the definitions of sine, cosine, and tangent to manually calculate the values.

No, trigonometric functions can be used with any type of triangle, not just right triangles. However, they are most commonly used with right triangles because of the relationship between the angle and sides in a right triangle.

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