2 Likes
Answered By
(cos4 θ − sin4 θ) is equal to :
2 cos2 θ + 1
2 cos2 θ − 1
2 sin2 θ + 1
2 sin2 θ − 1
If sec θ + tan θ + 1 = 0, then sec θ − tan θ is equal to :
−1
0
1
2