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Anasweet564
a fost răspuns

Aratati ca sin pi/4 + cos 3 pi /4=0

Răspuns :

sin de π/4=√2/2
cos de 3π/4 =cos (4π/4-π/4)
cos(π-π/4)=-√2/2
√2/2-√2/2=0
/ inseamna "pe" 
Veronica0
[tex]cos \frac{3 \pi }{4} =cos( \frac{ \pi }{2} + \frac{ \pi }{4} )=cos \frac{ \pi }{2} *cos \frac{ \pi }{4} -sin \frac{ \pi }{2} *sin \frac{ \pi }{4} =- \sqrt{2} /2 \\ \\ \frac{ \sqrt{2} }{2} - \frac{ \sqrt{2} }{2} =0[/tex]

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