find the value of 1/2sec80degree-2cos20degree.
find the value of 1/2sec80degree-2cos20degree.
Atish Dutta , 10 Years ago
Grade 11
Trigonometry> find the value of 1/2sec80degree-2cos20de...
1 AnswersAtish Dutta
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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