evalutate sin23*cos67+cos23*sin67
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sin23*cos67+cos23*sin67
=sin23*cos(90-23)+cos23*sin(90-23)
=sin23*sin23+cos23*cos23 {because sin(90-a)=cos a}
=(sin23)^2+(cos23)^2
=1.
=sin23*cos(90-23)+cos23*sin(90-23)
=sin23*sin23+cos23*cos23 {because sin(90-a)=cos a}
=(sin23)^2+(cos23)^2
=1.
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