Oblicz:
cos²105⁰-sin²105⁰=
korzystamy ze wzoru cos2x=cos²x-sin²x
Stad mamy
cos²105⁰-sin²105⁰=cos(2*105 ⁰)=cos 210⁰ =(-√3)/2
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korzystamy ze wzoru cos2x=cos²x-sin²x
Stad mamy
cos²105⁰-sin²105⁰=cos(2*105 ⁰)=cos 210⁰ =(-√3)/2