Question

sin 30° ( Cas 60*) – tan²45°​

Answer 1

sin 30° = 1/2

cos 60° = √3/2

tan 45° = 1

so,

sin 30° ( Cas 60°) – tan²45°

$\frac{1}{2} \times \frac{ \sqrt{3} }{2} - {1}^{2}$

$\frac{ \sqrt{3} }{4} - 1$

$\frac{ \sqrt{3 } - 4}{4}$

hope it helps