z trygonometrii Toja: Oblicz: a/ (sin 60` + cos 30`)² − (sin 30` + cos 60`)² b/ (tg 60` − sin 30`) x (cos 60` − ctg 30`) Bardzo prosze o pomoc

driver: a) sin60⁰=cos30⁰= ^√3₂, sin30⁰=cos60⁰=¹₂ (√3)² −1²=...... b) tg60⁰=ctg30⁰=√3 (√3−¹₂)x(¹₂−√3)=√3*¹₂−√3*√3−¹₂*¹₂+¹₂*√3=.......