[" 1.If "cos4x=1+k sin^(2)x cos^(2)x" ,t...

[" 1.If "cos4x=1+k sin^(2)x cos^(2)x" ,then "x+n cos x],[" (2) If "tan(x)/(2)=(m)/(n)," then write the value of "m sin x+n cos x],[qquad sqrt(1+cos2x)]

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