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[10." Prote that "4(cos66^(2)+sin84^(@))...

[10." Prote that "4(cos66^(2)+sin84^(@))=sqrt(3)+sqrt(15)],[ul(SECTHON)-R]

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cos66^(@)+sin84^(@)=

cos66^(@)+sin84^(@)=

Prove that 4(cos66^(@)+sin84^(@)) = sqrt(3) + sqrt(15) .

cos 66^(@) + sin 84^(@) =

4(sin24^(0)+cos6^(@))=sqrt(3)+sqrt(15)

prove that 4sin(24^(@)+cos6^(@))=sqrt(3)+sqrt(15)

Prove that, cos^(2)45^(@)-sin^(2)15^(@)=sqrt(3)/(4)

4(sin2 4^0+cos6^0)=sqrt(3)+sqrt(15)

4(sin2 4^0+cos6^0)=sqrt(3)+sqrt(15)

Prove that cos^2 45^@-sin^2 15^@=sqrt3/4