" 11.दिखाइए कि : "cos30^(@)=sqrt((1+cos60^(@))/(2))

Show that : cos30^(@)=sqrt((1+cos60^(@))/(2))

Show that : cos30^(@)=sqrt((1+cos60^(@))/(2))

Show that : sin 30^(@)=sqrt((1-cos60^(@))/(2))

Show that : sin 30^(@)=sqrt((1-cos60^(@))/(2))

cos 15^(@) =............. A) sqrt((1+cos 30^(@))/(2)) B) sqrt((1-cos 30^(@))/(2)) C) pm sqrt((1+cos 30^(@))/(2)) D) pm sqrt((1- cos30^(@))/(2))

(log)_(sin30^(@)cos60^(@))=1

Using the formula cos A =sqrt((1+cos2A)/(2)) , find the value of cos30^(@) , it is given that cos60^(@)=(1)/(2) .

Using the formula cos A =sqrt((1+cos2A)/(2)) , find the value of cos30^(@) , it is given that cos60^(@)=(1)/(2) .

Prove that : (i) ((tan 60^(@)+1)/(tan 60^(@) - 1))^(2) = (1 + cos 30^(@))/(1 - cos 30^(@)) (ii) 3 "cosec"^(2) 60^(@) - 2 cot^(2) 30^(@) + sec^(2) 45^(@) = 0

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