If sin (7α - 20°) = cos (20° - 5α) then the value of tanα .

2 -1 1 0

1

[Concept: sin A = cos` B, when A + B = 90°] Therefore, (7α - 20° + 20° - 5α) = 90° 2α = 90° α = 45° Put this value in find → ⇒ tanα  ⇒ tan45°  = 1