SSC IB ACIO Grade II Mock Test 2023 Quantitative Aptitude Trigonometry Circular Measure of Angles

cos3 60 - cos3 240 - cos3 360 = _______.

1
\(\frac{{ - 3}}{4}\)
2
\(\frac{{ - 7}}{5}\)
3
\(\frac{{ - 3}}{5}\)
4
\(\frac{{ - 9}}{7}\)
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