Question

sinA+cosA=0.4then find sin2A​

Answer 1

Answer:

0.84

Step-by-step explanation:

let sinA be s and cosA be c

then s+c=0.4

s^2+c^2 +2sc = (s+c )^2= 0.16

WE KNOW THAT SIN^2 +COS^2 = 1

THEREFORE, 1 +2sc=0.16

we know that sin2A= 2sinAcosA

so,sin2A= 2sc=0.16-1=(-0.84)