The Total solution for NCERT class 6-12
Show that
Given
Let the given determinant as A
Using sin (A+B) = sin A × cos B + cos A × sin B
⇒ |A|= sin 10° × cos 80° + cos 10° x sin 80°
|A| = sin (10 + 80)°
|A| = sin90°
|A| = 1
Hence Proved
