If 3 sin θ + 5 cos θ = 5, then what is the value of 5 sin θ – 3 cos θ equal to ?

Given, 3 sin θ + 5 cos θ = 5   –i)

Let,     5 sin θ – 3 cos θ =x     –ii) 

Squaring and adding (i) and (ii) we get,

=>

=>

=> x = ±3,

Hence from the option we get -3

Answer – (B)