Show that cos(2Tan^(-1).(1)/(7))=sin(2Ta...

Show that `cos(2Tan^(-1).(1)/(7))=sin(2Tan^(-1).(3)/(4))`

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theta-varphi=(pi)/(2) then show that [{:(cos^(2)theta,costhetasintheta...
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If ABCDEF is a regular hexagon with centre O , then P.T bar(AB)+bar(A...
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Let bar(a)=4bar(i)+5bar(j)-bar(k),bar(b)-bar(i)-4bar(j)+5bar(k)andbar(...
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Solve that sqrt(2)(sinx+cosx)=sqrt(3)
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Show that cos(2Tan^(-1).(1)/(7))=sin(2Tan^(-1).(3)/(4))
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Show that a^(2)cotA+b^(2)cotB+c^(2)cotC=(abc)/(R)
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