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Calculati valoarea expresiei : E= sin 30 grade × cos 60 grade - tg 45 grade

Răspuns :

Wolfii
sin 30 grade = [tex] \frac{1}{2} [/tex]
cos 60 grade= [tex] \frac{1}{2} [/tex]
tg 45 grade= 1
=> E= [tex] \frac{1}{2} * \frac{1}{2} -1= \frac{1}{4} -1= \frac{1-4}{4} = \frac{-3}{4} [/tex]

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