Correct Answer - Option 1 : 16/25
Given:
(sin θ + cos θ)/(sin θ – cos θ) = 3
Concept used:
By Componendo and Dividendo rule;
a/b = c/d
⇒ (a + b)/(a – b) = (c + d)/(c – d)
Formula used:
tan θ = Perpendicular/Base
sin θ = Perpendicular/Hypotenuse
By Pythagoras theorem,
Hypotenuse2 = Perpendicular2 + Base2
Calculation:
(sin θ + cos θ)/(sin θ – cos θ) = (3 + 1)/(3 – 1)
⇒ (sin θ + cos θ +sin θ – cos θ)/(sin θ + cos θ – sin θ + cos θ) = 4/2
⇒ 2sin θ/2cos θ = 2
⇒ sin θ/cos θ = 2
⇒ tan θ = 2/1
⇒ Perpendicular = 2
⇒ Base = 1
Now,
Hypotenuse2 = Perpendicular2 + Base2
⇒ h = √(p2 + b2)
⇒ h = √(22 + 12)
⇒ h = √(4 + 1)
⇒ h = √5
According to the question:
sin4 θ = (Perpendicular/Hypotenuse)4
⇒ (2/√5)4
⇒ 16/25
∴ The answer is 16/25.