Question

6.
If sina = 1/2 and cosß = 1/2 then (a + B) = ?​

Answer 1

$we \: have : \\ sin \alpha = \frac{1}{2} and \: \: \cos \beta = \frac{1}{2} \\ = > sin \alpha = sin30° \: and \: cos \beta = cos60 °\\ (sin30° = \frac{1}{2} and \: cos60° = \frac{1}{2} ) \\ = > \alpha = 30° \: and \: \beta = 60 °\\ hence \\ \alpha + \beta = 30° + 60 °= 90°\\ answer\:=90°$