Question

Sin2x=cos4x.then x equals to?

Answer 1

Sin2x=cos4x
We know that,
Sin(90-A)=CosA
So,
Sin2x=Sin(90-4x)
2x=sin(90-4x)/sin
2x=90-4x
6x=90
x=15

Answer 2

Step-by-step explanation:

sinx=cos4x

now we can write like this

sinx=sin(90-4x)

this is possible when

x=90-4x

this implies

x+4x=90

5x=90

x=90/5

therefore

x=18

hope these answer will help you!!!!!