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cos75°cos15°-sin255°sin165°的值是（）．
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cos75°cos15°-sin255°sin165°的值是
A
B
C
D
已知向量a＝cos75°sin75°b＝cos15°sin15°那么|a－b|的值是
1
求值cos75°cos15°﹣sin75°sin15°=.
cos75°cos15°-sin255°sin165°的值是．
选项A
选项B
选项C
选项D
cos75°cos15°-sin255°sin165°的值是．
选项A
选项B
选项C
选项D
cos75°cos15°-sin255°sin165°的值是．
A
B
C
D
cos75°cos15°-sin255°sin165°的值是
选项A
选项B
选项C
选项D
计算sin105°×cos75°的值等于．
sin15°cos75°+cos15°sin105°等于
0
1
cos75°cos15°-sin255°sin165°的值是
选项A
选项B
选项C
选项D
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