A function whose graph is symmetrical about the y−axis is given by
f(x)=sin[log(x+√x2+1)]
f(x)=sec4x+csc4xx3+x4cotx
f(x+y)=f(x)+f(y)∀x,y∈R
f(x)=x2
A
f(x)=sec4x+csc4xx3+x4cotx
B
f(x+y)=f(x)+f(y)∀x,y∈R
C
f(x)=sin[log(x+√x2+1)]
D
f(x)=x2
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