Question

given that sin =a/b then cos is equal to​

Answer 1

Step-by-step explanation:

cosA =✓(b^2-a^2)/b^2

cos^2A=1-sin^2A

here=sinA=a/b

Answer 2

Answer:

sin = opposite side / hypotenuse

so when we take a triangle, (refer picture)

that way, AB becomes a and AC becomes b.

cos= adjacent side/ hypotenuse

adjacent side can be calculated using pythogoras theorem

a^2 +(BC)^2= b^2

(BC)^2= a^2+b^2

BC= √a^2 +b^2

cos = √a^2 +b^2/b