Let vecf(t)=[t] hat i+(t-[t]) hat j+[t+...

Let ` vecf(t)=[t] hat i+(t-[t]) hat j+[t+1] hat k , w h e r e[dot]` denotes the greatest integer function. Then the vectors ` vecf(5/4)a n df(t),0lttlti` are(a) parallel to each other(b) perpendicular(c) inclined at `cos^(-1)2 (sqrt(7(1-t^2)))` (d)inclined at `cos^(-1)((8+t)/sqrt (1+t^2))`;

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