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Trigonometric Half Angle Identities Answers

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Which of these expressions is the simplified form of the expression ?

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A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
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cos x ✔ 1 + cos x1 - cos x

A
cos x
B
✔ 1 + cos x
C
1 - cos x
3

cos x 1 + cos x ✔ 1 - cos x

A
cos x
B
1 + cos x
C
✔ 1 - cos x
171920

Analyze the proof. Use the drop-down boxes to complete the sentences.

Answers:
The third line of this proof is known as the . identity of cosine. The justification for the fourth line is .:power reducing
The third line of this proof is known as the . identity of cosine. The justification for the fourth line is .:substitution
171921

cancelation ✔ substitutioncombination

A
cancelation
B
✔ substitution
C
combination

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