[" 7."[" यf "A=30^(@)" ,तब Verify the following : "],[" (i) "sin2A=2sin A cos A]]

Taking theta=30^(@) , verify each of the following (i) sin 2theta=2sin theta cos theta (ii) cos theta=2cos^(2)theta-1=1-2sin^(2)theta (iii) tan2theta=(2tantheta)/(1-tan^(2)theta)

If /_A=30^(@), verify each of the following (i)sin2A=(tan A)/(1+tan^(2)A)(ii)cos A=(1-tan^(2)A)/(1+tan^(2)A)

Taking theta=30^(@) , verify each of the following (i) sin 3theta=3sin theta -4sin^(3) theta (ii) cos3 theta=4cos^(3)theta-3cos theta

If A= 45^@ , verify that : sin 2A =2 sin A cos A .

Evaluate the following:(i) sin 60^@ cos30^@+sin 30^@ cos 60^@

If A =30^(@) ,verify that cos2A =cos^(2)A-sin^(2)A .

If A =30^(@) ,verify that cos2A =cos^(2)A-sin^(2)A .

If A= 45^(@) , verify that: (i) sin 2A=2 sin A cos A (ii) cos 2A= cos^(2)A-"sin"^(2)A .

If A=45^(@) , verify that (i) sin2A=2sinAcosA (ii) cos2A=2cos^(2)A-1=1-2sin^(2)A

If A= 30^(@) and B=60^(@) verify that: sin (A+B)= sin A cos B +cosA sin B.