Oblicz bez użycia tablic. (sin25°+cos25°)(sin25°-cos25°)+2sin²65°

[latex]left ( sin25^{o} + cos 25^{o} ight ) left (sin 25^{o} - cos 25^{o} ight ) + 2 sin^{2} 65^{o} = \ \ = sin^{2} 25^{o} - cos^{2} 25^{o} + 2 sin ^{2} (90^{o} - 25^{o} ) = \ \ = sin^{2} 25^{o} - cos^{2} 25^{o} + 2 cos^{2} 25^{o} = \ \ = sin^{2} 25^{o} + cos^{2} 25^{o} = oxed{1}[/latex]

Oblicz bez użycia tablic: a)(sin25°+cos25°)(sin25°-cos25°) + 2sin²65° b)cos²10°+cos²80° c)(cos17² +cos 73°)² + (sin17°-sin73°)² d)ctg10° × ctg20° × ctg30°× ctg40° × ctg50° x ctg60° x ctg 70° x ctg80° Pilne PILNE PIlne

Oblicz bez użycia tablic: a)(sin25°+cos25°)(sin25°-cos25°) + 2sin²65° b)cos²10°+cos²80° c)(cos17² +cos 73°)² + (sin17°-sin73°)² d)ctg10° × ctg20° × ctg30°× ctg40° × ctg50° x ctg60° x ctg 70° x ctg80° Pilne PILNE PI...