化简:cos^(@+15度)+sin^(@-15度)+sin(@+180度)cos(@-180度)
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/06 02:21:46
化简:cos^(@+15度)+sin^(@-15度)+sin(@+180度)cos(@-180度)
cos^2(a+15)+sin^2(a-15)+sin(a+180)cos(a-180)
=cos^2(a+15)+sin^2(a-15)+sinacosa
=[cos2(a+15)+1]/2+[1-cos2(a-15)]/2+sinacosa
=1+1/2[cos(2a+30)-cos(2a-30)]+1/2sin2a
=1+1/2(cos2acos30-sin2asin30-cos2acos30-sin2asin30)-1/2sin2a
=1+1/2(-2sin2asin30)-1/2sin2a
=1-1/2sin2a-1/2sin2a
=1
=cos^2(a+15)+sin^2(a-15)+sinacosa
=[cos2(a+15)+1]/2+[1-cos2(a-15)]/2+sinacosa
=1+1/2[cos(2a+30)-cos(2a-30)]+1/2sin2a
=1+1/2(cos2acos30-sin2asin30-cos2acos30-sin2asin30)-1/2sin2a
=1+1/2(-2sin2asin30)-1/2sin2a
=1-1/2sin2a-1/2sin2a
=1
化简:cos^(@+15度)+sin^(@-15度)+sin(@+180度)cos(@-180度)
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