Allied AnglesEasyQuestion 200008
Question
cos(180° + θ) equals:
- Acos θ
- B−cos θCorrect
- Csin θ
- D−sin θ
Correct answer
−cos θ
Explanation
180° + θ is in Q3 (for 0 < θ < 90°). cos is negative in Q3. cos(180° + θ) = −cos θ.
JEE Mathematics · Easy
Trigonometry: Allied Angles MCQ
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