Trigonometry Examples

Find the Cosine Given the Point (-5,-(3pi)/4)
Step 1
To find the between the x-axis and the line between the points and , draw the triangle between the three points , , and .
Opposite :
Adjacent :
Step 2
Find the hypotenuse using Pythagorean theorem .
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Step 2.1
Raise to the power of .
Step 2.2
Use the power rule to distribute the exponent.
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Step 2.2.1
Apply the product rule to .
Step 2.2.2
Apply the product rule to .
Step 2.2.3
Apply the product rule to .
Step 2.3
Raise to the power of .
Step 2.4
Multiply by .
Step 2.5
Raise to the power of .
Step 2.6
Raise to the power of .
Step 2.7
To write as a fraction with a common denominator, multiply by .
Step 2.8
Combine and .
Step 2.9
Simplify the expression.
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Step 2.9.1
Combine the numerators over the common denominator.
Step 2.9.2
Multiply by .
Step 2.10
Rewrite as .
Step 2.11
Simplify the denominator.
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Step 2.11.1
Rewrite as .
Step 2.11.2
Pull terms out from under the radical, assuming positive real numbers.
Step 3
therefore .
Step 4
Simplify .
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Step 4.1
Multiply the numerator by the reciprocal of the denominator.
Step 4.2
Multiply by .
Step 4.3
Combine and simplify the denominator.
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Step 4.3.1
Multiply by .
Step 4.3.2
Raise to the power of .
Step 4.3.3
Raise to the power of .
Step 4.3.4
Use the power rule to combine exponents.
Step 4.3.5
Add and .
Step 4.3.6
Rewrite as .
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Step 4.3.6.1
Use to rewrite as .
Step 4.3.6.2
Apply the power rule and multiply exponents, .
Step 4.3.6.3
Combine and .
Step 4.3.6.4
Cancel the common factor of .
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Step 4.3.6.4.1
Cancel the common factor.
Step 4.3.6.4.2
Rewrite the expression.
Step 4.3.6.5
Simplify.
Step 4.4
Multiply .
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Step 4.4.1
Combine and .
Step 4.4.2
Multiply by .
Step 4.5
Move the negative in front of the fraction.
Step 5
Approximate the result.