Calculate tan⁡−1((29⋅sin⁡(50)78⋅sin(210))29⋅cos(50)78⋅cos(210))tan −1 (29⋅cos(50)78⋅cos(210(29⋅sin(50)78⋅sin(210)) ):
a) π/4
b) π/2
c) π
d) 2π