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[" 29.Given the function "f(x)=(a^(x)+a^...

[" 29.Given the function "f(x)=(a^(x)+a^(-x))/(2)(" where "a>2/ pi],[[" (a) "2f(x)*f(y)," (b) "f(x)*f(y)],[" (a) "2f(x)," (b) "f(x)*f(y)],[" (x)and "=," (c) "(f(x))/(f(y))," (d) none of these "],[" 30.If "f(x)=cos(log_(e)x)," then "f(x)f(x)-(1)/(-)[f((x)/(2))+f(x)," (c) None "]]

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