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A xsin²x B xcos²x C xsinx D xcosx

A <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111346_5709.png" width="58" height="16" />  B <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111350_2740.png" width="58" height="17" />  C y=sinx D y=x²

A (-∞，-1) B (-1，0) C (0，1) D (1，+∞)

A (-∞，1) B (-∞，2) C (1，+∞) D (2，+∞)

A 2x-y-1=0 B 2x+y-1=0 C 2x-y+1=0 D 2x+y+1=0

A in2 B 2ln2 C <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111453_2584.png" width="18" height="25" />  D <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111501_5240.png" width="18" height="25" /> 

A <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111521_1783.png" width="67" height="25" />  B <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111528_8217.png" width="48" height="27" />  C <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111533_5092.png" width="64" height="25" />  D <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111537_8686.png" width="65" height="27" /> 

A <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111542_0873.png" width="71" height="26" />  B <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111548_5248.png" width="54" height="26" />  C <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111739_4624.png" width="57" height="26" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/20191017111555_7279.png" width="40" height="26" /> 

A 0．98 B 0．9 C 0．8 D 0．72