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Grade 11Trigonometry

find the value of 1/2sec80degree-2cos20degree.

Profile image of Atish Dutta
11 Years agoGrade 11
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1 Answer

Profile image of Atish Dutta
11 Years ago
1/2sec80degree-2cos20degree
=1/2cos80degree-2cos20degree
=1-2.2cos80degreecos20degree/2cos80degree
=1-2(cos100degree+cos60degree)/2cos80degree
=[1-2cos(180degree-80degree)-2.1/2]/2cos80degree
=1

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