\"\"

\

\"\"

\

\"\"

\

\"\"

\

As we know \"\"

\

\"\"

\

\"\"

\

 

\

\"\"

\

\"\"

\

\"\"

\

 

\

(b)

\

\"image\"

\

cos (-x) = cos x                                 [ since cos is a even function ]

\

\"image\"

\

Now compare \"image\" and  \"\" .

\

Amplitude = │a│

\

               =│-6│

\

               = 6

\

So the  amplitude is 6 .

\

The  period is \"\"

\

\"\"

\

\"\"

\

So the period of the function is 3/2 .