wzory redukcyjne natalia:

sin2(−330°)−cos2(−2250°)
tg2(210°) + ctg2(−240°)

Jack: sin²(−330) = sin(−330) * sin(−330) = −sin(330) * (−sin(330)) = sin(360−30) * sin(360−30) =

	1		1		1
= − sin 30 * (− sin(30)) =		*		=
	2		2		4

cos²(−2250)= cos(−2250) * cos(−2250) = cos(2250) * cos(2250) = 2250 = 360*6 + 90 zatem cos(2250) * cos(2250) = cos(360*6+90) * cos(360*6+90) = cos 90 * cos 90 = 0 tg²(210) = tg(210) * tg(210) = tg(180+30) * tg(180+30) = = tg30 * tg30 = ... ctg²(−240) = ctg(−240) * ctg(−240) = ctg(240) * ctg(240) = ...