Question

If sintita=4/5 and tita does not lies in first quadrant then find cos tita​

Answer 1

Solution :

It is given that Θ doesn't lies in first Quadrant.

• Sin θ = 4/5

We need to find cos θ

We know that sin θ = Perpendicular/Hypotenuse

• perpendicular = 4
• Hypotenuse = 5
• cos θ = base/Hypotenuse
• Base = ???

Firstly we have to find the value of Base for finding value of cos θ.

By using Pythagoras theorem

Hypotenuse ² = Base² + Perpendicular ²

›› 5² = b² + 4²

›› 25 = b² + 16

›› b² = 25 - 16

›› b = √9

• Base = 9

So,

• Cos θ = - 9/5

As theta doesn't lies in first Quadrant and in first Quadrant sin θ is always +ve So, value of cos θ will be negative.

━━━━━━━━━━━━━━━━━━━━━━━━━

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀Done࿐

Answer 2

Answer:

Okie Byeee

Deactivating this I'd

Tc

¯\_(ツ)_/¯

No more Brainly now