Question

cos2a =Sin a find 2a​

Answer 1

Answer:

2A = 60

cos(2A) = sin(A)

sin(90-2A) = sin(A)

90 - 2A = A

90 = 3A

A = 30

answer is 60 .

Answer 2

Answer:

60°

Step-by-step explanation:

cos2A = sinA

sin(90-A) = cosA

so cos2A=sin(90-2A)

sin(90-2A)=sinA....from the question

90-2A=A

90 = 3A

A=30

2A= 60°

hope it helps u

mark as brainliest

as u r in tenth it doesn't matter but as info

by double angle method u will find infinite solution

A can also be -90°..and infinite more..

good luck for your boards :)