Question

calcule ...........​

Answer 1

a)

$\sin( \alpha ) = \frac{9 \div 3}{15 \div 3} = \frac{3}{5}$

b)

$\cos( \alpha ) = \frac{12 \div 3}{15 \div 3} \\ \cos( \alpha ) = \frac{4}{5}$

c)

$\tan( \alpha ) = \frac{9 \div 3}{12 \div 3} \\ \tan( \alpha ) = \frac{3}{4}$