Question

sinA+sin5A+sin9A
cosA+cos5A+cos9A​

Answer 1

Answer:

tan 5A

Step-by-step explanation:

=sin A+sin 9A+sin5A/cosA +cos 9 A+ cos 5A

= 2 sin 5A .cos (-4A)+ sin 5A/2 cos 5A .cos -4A +cos 5A

= sin 5A(2 cos 4A + 1)/cos 5A (2 cos 4A + 1)

= sin 5A/ cos 5A

= tan 5 A

hope it helps you