Question : Find the exact value of $\cos 120°$.
Option 1: 1
Option 2: 0
Option 3: – 0.5
Option 4: 0.5
Latest: SSC CGL preparation tips to crack the exam
Don't Miss: SSC CGL complete guide
Correct Answer: – 0.5
Solution :
$\cos 120°$
$= \cos(90° + 30°)$
$=-\sin 30°$ (we know that $\cos (90° + x) = –\sin x$)
$= -\frac{1}{2}$
$= -0.5$
Hence, the correct answer is – 0.5.
Related Questions
Know More about
Staff Selection Commission Combined Grad ...
Answer Key | Eligibility | Application | Selection Process | Preparation Tips | Result | Admit Card
Get Updates BrochureYour Staff Selection Commission Combined Graduate Level Exam brochure has been successfully mailed to your registered email id “”.