bilal3627 bilal3627

03-06-2017
Mathematics

contestada

if cos3a=sin(a-22°) ,where 3a & (a-22°) are acute angles find a

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anonymous79 anonymous79

03-06-2017

since they are acute, they lie in first quadrant
how to check that they are correct??
Substitute a=28 into the equation
cos(3*28)=0.104...
sin(28-22)=0.104
hence it is correct

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