Fri October 26, 2012 By: Ashrene

consider the formulae sin(A+B)=sinAcosB+cosAsinB and cos(A+B)=cosAcosB-sinAsinB Using the above formulae find tan75

Expert Reply
Fri October 26, 2012
To find tan 75, first find sin 75 and cos 75 and then use the formula tan A = sinA/ cosA
You can find sin 75 by taking A = 45 and B = 30 and using the formula of sin (A + B).
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