Question

If cos A+iB) = cos & sino show that
Cos 2A+Cos h
B=2​

Answer 1

Answer:

1

Step-by-step

sin2A+sin4A=1−cos2A+(1−cos2A)2

sin2A+sin4A=1−cos2A+(1−cos2A)2=cosA+cos2A, as given cosA+cos2A=1

sin2A+sin4A=1−cos2A+(1−cos2A)2=cosA+cos2A, as given cosA+cos2A=1=1

Please mark me as brainlist