Answer:

Step-by-step explanation:

=(sin6x + sin4x)(sin6x - sin4x)

=2sin5xcosx 2cos5xsinx

=4sin5xsinxcos5xcosx

a^2 - b^2 = (a+b)(a-b)

sinA + sinB = 2sin A+B/2 cos A-B/2

sinA - sinB = 2cos A+B/2 sin A-B/2

Hope for brainliest!!!