Question

acum !Urgent sin30×cos45-sin45×cos 60=?​

Answer 1

Răspuns:

sin30⁰×cos45⁰-sin45⁰×cos6⁰ =

$\frac{1}{2} \times \frac{1}{ \sqrt{2} } - \frac{1}{ \sqrt{2} } \times \frac{1}{2} = \frac{1}{2} \times \frac{ \sqrt{2} }{2} - \frac{ \sqrt{2} }{2} \times \frac{1}{2} = \frac{ \sqrt{2} }{4} - \frac{ \sqrt{2} }{4} = 0$