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cos60^(@)=1-2sin^(2)30=2cos^(2)30-1...

cos60^(@)=1-2sin^(2)30=2cos^(2)30-1

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sin^(2)30+cos^(2)60

Prove that : cos^(2)30^(@)-sin^(2)30^(@)=cos60^(@)

Prove that : cos^(2)30^(@)-sin^(2)30^(@)=cos60^(@)

Prove that cos 60^(@)=cos^(2)30^(@)-sin^(2)30^(@) .

cos^(2)30^@-sin^(2)30^@=cos60^@

Show that : cos^(2)60^(@)-sin^(2)60^(@)=-sin30^(@)

Show that : cos^(2)60^(@)-sin^(2)60^(@)=-sin30^(@)

Show that : cos 60^(@)=2cos^(2)30^(@)-1

Show that : cos 60^(@)=2cos^(2)30^(@)-1

Prove that : sin60^(@)=2sin30^(@)cos30^(@) .