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Let the speed of boat in still water be x km/hr. According to the question, => x + 5 + x − 5 = 30 => x = 15 Downstream speed = 5 + 15 = 20 km/hr Required time = 40/20 = 2 hrs
if 8 sin 2 x + 3 cos 2 x = 4 then find tan x
Take θ = 450
If (1+sinθ)/cosθ = x, then find the value of secθ?
1. 
If cot8A = tan(A+8˚), find the value of A? Given that 8A and A+8 are acute angles.
If 9 sinx + 40 cosx = 41 then find tanx.
sin2 9 ° + sin2 10 ° + sin2 11 ° + sin2 12 ° + ……… + sin2 81 ° = ?
...What is the value of cos [(180 – θ)/2] cos [(180 – 9θ)/2] + sin [(180 – 3θ)/2] sin [(180 – 13θ)/2]?
