Korzystając ze wzoru sin(alfa +beta)=sinα *cosBeta + cosα * sinBeta. Oblicz sin75 stopni
alfa=30
beta=45
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sin(30+45)=sin30*cos45+cos30*sin45=
=1/2*√2/2+√3/2*√2/2=√2/4+√6/4=
=(√2+√6)/4
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alfa=30
beta=45
========================
sin(30+45)=sin30*cos45+cos30*sin45=
=1/2*√2/2+√3/2*√2/2=√2/4+√6/4=
=(√2+√6)/4
=============================