Question

Sin 9° + cos9° =
1)√5 - 1 /2√2
2)√5 + 1 /2√2
3)√5 + 1 /2
4)√5 - 1/2

Choose the correct option.​

Answer 1

Step-by-step explanation:

sin9°+cos9°=1/2[√(√5±3)]

sin9°-cos9°=1/2[√(5±√5)]