tan81° - tan63° - tan27° + tan9° = ?
6
0
2
4
If x and y are acute angles such that cos(x) + cos(y) = 32sin(x) + sin(y) = 34, then sin(x + y) equals to
25
34
35
45
The sum of the solutions in 0, 2π the equation cosxcosπ3 - xcosπ3 + x = 14 is
4π
π
2π
3π
In any ∆ABC, a + b + cb + c - ac + a - ba + b - c4b2c2 = ?
sin2B
cos2A
cos2B
sin2A
∑k = 16 sin2kπ7 - icos2kπ7 = ?
- 1
- i
i
If ssinθ + cosθ = p and tanθ + cotθ = q, then q(p2 - 1) is equal to
12
1
3
tanπ5 + 2tan2π5 + 4cot4π5 is equal to
cotπ5
cot2π5
cot3π5
cot4π5
If sin(A) + sin(B) + sin(C) = 0 and cos(A) + cos(B) + cos(C) = 0, then cos (A + B) + cos (B + C) + cos(C + A) is equal to
cos(A + B + C)
If tanθ . tan120° - θtan120° + θ = 13, then θ is equal to
nπ3 + π18, n ∈ Z
nπ3 + nπ12, n ∈ Z
nπ12 + π12, n ∈ Z
nπ3 + π6, n ∈ Z
1 + cosπ8 - isinπ81 + cosπ8 + isinπ88 = ?