December 2018 1 2K Report
Oblicz stosując wzory redukcyjne:
a) tg 43° · tg 44° · tg 45° · tg 46°· tg 47°
b) ctg 25° · ctg 35° · ctg 45° · ctg 55° · ctg 65°
c) sin²75° + sin²15° - 2sin 30°
d) (cos 52° - cos 38°)² + 2sin 38° · sin 52° + 2cos 60°
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