The value of is

42

The value of tan 3A – tan 2A –tan A is equal to

43

The value of sin (45° + θ) – cos (45°–θ) is

45

cos 2θ cos 2ϕ + sin²(θ–ϕ) – sin²(θ + ϕ) is equal to

46

The value of cos 12° + cos 84° + cos 156° + cos 132° is