Połącz ze sobą odpowiednie wyrażenia:
1)tg45°-sin²60° a)√2/2
2)tg30°·ctg60°+sin30° b)⅓
3)2sin²45°-1 c)¼
d)0
e)2
f)⅚
plissss pomóżcie
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1) tg45°-sin²60° = 1 - (√3/2)^2 = 1 - 3/4 = 1/4
2)tg30°·ctg60°+sin30° = √3/3 * √3/3 + 1/2 = 3/9 + 1/2 = 1/3 + 1/2 = 5/6 3)2sin²45°-1 = 2 * (√2/2)^2 - 1 = 2 * 2/4 - 1 = 1 - 1 = 0