Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Mathematics Trigonometry Trigonometric Identities
If sin A + sin2A = 1 and a cos12A + b cos10A + c cos8A + d cos6A = 1 then \(b +\frac{c}{a} \) ?
1
4
2
1
3
6
4
More than one of the above
5
None of the above