`(7pi)/6` Evaluate the sine, cosine and tangent of the angle without using a calculator.

1 Answer

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balajia | College Teacher | (Level 1) eNoter

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sin(7pi/6)=sin(pi+pi/6)=-sin(pi/6)=-1/2

cos(7pi/6)=cos(pi+pi/6)=-cos(pi/6)=-sqrt(3)/2

tan(7pi/6)=tan(pi+pi/6)=tan(pi/6)=1/sqrt3