Question

Sin78°19'Cos18°19'-Sin11°41'+sin18°19'

Answer 1

Answer:

√3/2

Step-by-step explanation:

given statement = cos 11° 41' cos 18° 19' - sin 11° 41'

sin 18° 19' = cos ( 11° 41' + 18° 19') = cos 30° = √3/2.

Answer 2

Answer:

Step-by-step explanation:

sin 78°19'. cos18° 19' - sin 11' 41' sin 18'19'

= sin 78° 19'cos18'19' - sin (90°-78°19') sin 18'19'



= sin 78° 19' coos18°19' - cos 78°19' sin 18°19'

= sin (72°19' - 18°19')

= sin 60°

= √3/2 (Ans:)