# Evaluate sec((5pi)/6)

Apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Make the expression negative because secant is negative in the second quadrant.

The exact value of is .

Multiply by .

Combine and simplify the denominator.

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Multiply and .

Raise to the power of .

Raise to the power of .

Use the power rule to combine exponents.

Add and .

Rewrite as .

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Use to rewrite as .

Apply the power rule and multiply exponents, .

Combine and .

Cancel the common factor of .

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Cancel the common factor.

Rewrite the expression.

Evaluate the exponent.

The result can be shown in multiple forms.

Exact Form:

Decimal Form: