Evaluate without the aid of calculators or tables. Answer in radians. 
Definitions:
Calculator
An electronic or mechanical device used to perform mathematical calculations, ranging from basic operations to complex functions.
Rational Exponents
Fractional exponents, with the numerator indicating the exponentiation level and the denominator designating the root level of the primary number.
Simplify
The process of making an expression easier to understand by reducing it to its simplest form.
Expression
A combination of symbols and numbers to represent a mathematical operation or quantity.
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