Simplify cos(-270)

Problem

cos(−270)

Solution

1. Apply the even-odd identity for the cosine function, which states that cos(−θ)=cos(θ)

cos(−270)=cos(270)

2. Use the periodicity property or the unit circle to evaluate the cosine of the angle.

cos(270)=0

Final Answer

cos(−270)=0

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