1.

If R: A2 + B2 + 2AB coso, if IAI 리미 then value of R is equivalent to :(A) 2AcosFind the first derivative and second derivative of given functions wr.t. the independent variable x.4*.(B) Acos(C) 2Acos(D) 2Bcos2

Answer»

R^2 = A^2 +B^2 + 2ABCOSX

R^2 = A^2 +B^2 + 2AACOSX

R^2 = 2A^2 + 2A^2COSX

R^2 = 2A^2(1+COSX)

R^2 = 2A^2(2(COSX/2)^2)

( Because : {COS2X= 2(COSX)^2-1} )

R^2 = 4 A^2 (COSX/2)^2

R = 2ACOSX/2



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