defence exam Indian Coast Guard Assistant Commandant (GD/CPL) 2025 Test Series Mathematics Trigonometry Trigonometric Functions
Find the value of cos 4x
1
1 + 8 sin2 x + 8 sin4 x
2
1 - 8 sin2 x + 8 sin4 x
3
8 sin2 x + 8 sin4 x - 1
4
None of the above