Question

( sin79°cos11° + cos79°sin11°)=? *

Answer 1

Answer:

sin(79°+11°) = sin(90°) = 1

Answer 2

Step-by-step explanation:

we can write. 79° + 11° = 90°

79° = 90° - 11°

sin(90°-11°) cos 11° + cos(90°-11°) sin 11°

= cos²11° + sin²11°

we know that sin² a + cos² a = 1

= 1