Teaching BPSC बिहार मध्य विद्यालय (6 to 8) शिक्षक भर्ती 4.0 Mock Test Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities
If 2cos θ = x + 1/x then find the value of 2cos 3θ
1
x3 + 1/x3
2
x2 + 1/x2
3
x3 - 1/x3
4
More than one of the above
5
None of the above