# Worksheet: Evaluating Trigonometric Expressions Using Double-Angle Identities

Q1:

Find the value of .

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Q2:

Find the value of given where .

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Q3:

Find the value of given where .

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Q4:

Find the value of given where .

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Q5:

Find, without using a calculator, given where .

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Q6:

Find the value of given where .

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Q7:

Find the value of given where .

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• E

Q8:

Find the value of without using a calculator.

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Q9:

Find the value of given where is a positive acute angle.

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Q10:

Find the value of given where without using a calculator.

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Q11:

Find the value of given where .

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• E

Q12:

Find the value of without using a calculator.

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Q13:

Find the value of given where and where .

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• E

Q14:

Find, without using a calculator, the value of given where .

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Q15:

Find, without using a calculator, the value of given where .

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Q16:

Find, without using a calculator, the value of given , where .

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Q17:

Find, without using a calculator, the value of given where .

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Q18:

Find the value of without using a calculator.

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Q19:

Find the value of without using a calculator.

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Q20:

Find given .

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Q21:

Find, without using a calculator, the value of given where .

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Q22:

Evaluate without using a calculator.

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Q23:

Find the value of given .

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• E

Q24:

Find, without using a calculator, the value of given where .

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• D

Q25:

Evaluate without using a calculator.

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