find the value of sin 75 ° + sin 15 ° = ?
"sin a + sin b = 2 sin [ ( a + b ) / 2 ] cos [ ( a - b ) / 2 ] = 2 sin [ ( 75 + 15 ) / 2 ] cos [ ( 75 - 15 ) / 2 ] = 2 sin 90 cos 60 = 2 * 1 * ( 1 / 2 ) = 1 answer : c"
multiply(75, 15)