1) 2sin75°cos75°
2) 2sin π/8 cos π/8
3) sin π/12 cos π/12
4) (cos15°-sin15°)^2
2) 2sin π/8 cos π/8
3) sin π/12 cos π/12
4) (cos15°-sin15°)^2
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Answers & Comments
1)sin150°= 1/2
2)sinп/4=√2/2
3)1/2sin п/6=0,5*0,5=0,25
4)cos^2 15°-2sin15°cos15°+sin^2 15°=1-sin30°=1-0.5=0.5