Prove that : cosA cos2A cos4A cos8A =sin16A / 16sinA
Please explain working
prove that 1+cos2x+cos4x+cos6x= 4cosx cos2x cos3x.
EVALUATE cos(-1125)
Solve sin2x+sin4x+sin6x=0
prove that
cos20cos40cos60cos80 =1/16
Prove that : cosA cos2A cos4A cos8A =sin16A / 16sinA
Please explain working
prove that 1+cos2x+cos4x+cos6x= 4cosx cos2x cos3x.
EVALUATE cos(-1125)
Solve sin2x+sin4x+sin6x=0
prove that
cos20cos40cos60cos80 =1/16