Question

If sinA =
3/4
, evaluate the cos A.​

Answer 1

Step-by-step explanation:

Sin A = 3/4

Sin theta = perpendicular/ Hypotenuse = P/H

According to Pythagoras theorem:

H^2= P^2+ B^2

4^2=3^2+B^2

B^2= 16-9

B=√7

Therefore Cos A= Base/ Hypotenuse= B/H

= √7/4

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