Answer:
24/25
Explanation:
use tan^-1 to find the angle
tan^-1(3/4)=36.86989765°
A =36.86989765°
2A= 2×36.86989765
=73.73979529°
sin2A>>>>sin(73.73979529°)
=24/25 or 0.96
sin2A =
using the identity
sin2A = 2sinAcosA
given
tan2A = =
then this is a 3- 4- 5 right triangle with
hypotenuse = 5, opposite = 3 , adjacent = 4 , then
sinA = = and cosA = =
Then
sin2A = 2 × × = =
1.6m questions
2.0m answers