题目

计算:(1)tan30°·cos30°+sin60°-cos45°·tan45°;(2)tan245°+-3sin260°+tan45°sin30°. 答案:【答案】(1);(2)【解析】根据特殊角的三角函数值计算即可.原式== (2)原式. — May I take the magazine out of the reading room? — No, you can’t. You _________ read it here. It’s the rule.   A. must       B. would        C. may       D. might
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