Trigonometric Double Angle Identities Answers

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Provide the justifications for steps in the derivation shown.

Double angle

Power reducing

Pythagorean

Provide the justifications for steps in the derivation shown.

Division property of equality

Multiplication property of equality

Substituting a quantity for its equal

Provide the justifications for steps in the derivation shown.

Division property of equality

Multiplication property of equality

Square root property of equality

♦:

squared angle

double angle

half angle

♦:

cross-multiply

multiply by 1 – cos(x)

multiply by a form of 1

What is the exact value of cos(105°) ?

Option

♣:

cosine half-angle identity

Pythagorean identity

sine half-angle identity

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