Question

5sina=3 find the value of cos a =?​

Answer 1

Answer:

............. . . .........

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Answer 2

Answer:

Cos(a) = 4/5

Step-by-step explanation:

GIVEN : 5Sin(A)=3

Now, Sin(A) = 3/5 --------(1)

As we know, Sin(thetha)=Perpendicular/Hypotenuse -----(2)

By comparing both the equations we get ,

3/5 = Perpendicular/Base

That is Perpendicular = 3 and Base = 5.

Now to find value of cos(A) we need to find base.

To find base use PYTHAGORAS THEOREM ,

(P)² + (B)² = (H)²

(3)² + (B)² = (5)²

9 + (B)² = 25

(B)² = 25-9

(B)² = 16

Hence B = 4

So Cos(A) = 4/5 {Because Cos(thetha) = Base/Hypotenuse}

I HOPE YOU EASILY UNDERSTAND THE ABOVE SOLUTION .