Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

sin (50° +θ) - cos (40° - θ) + tan 1° ⋅ tan 10°⋅ tan 20°⋅ tan 70°⋅ tan 80°⋅ tan 89°⋅  ?

1
1
2
-1
3
0
4
±1

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