Page 100 - 4. UKBM MAT WA

1. Diketahui fungsi   sinf x  x . Tentukanlah nilai dari

 1   2 
a. f   b. f   c.   0f

 2   3 
Jawab:
 1   1 
a. f    sin    ...............................................................................................


 2   2 
 2  2
b. f    sin  ....................................................................................................
 3  3

c. f   0  sin0 .............................................................................................................

2. Diketahui   1 cosf x   x

  
a. f    ...................................................................................................................
 3 
b. f   ..................................................................................................................... 

 3 
c. f    ..................................................................................................................
 4 

3. Diketahui   sinf x   x  1 



 2 
  
a. f    .....................................................................................................................
 4 
 3 
b. f    ...................................................................................................................
 4 
 3 
c. f    ....................................................................................................................
 2 

4. Diketahui   3sinf x  x  2cos x

 5 
a. f    ...................................................................................................................
 4 
b. f   0  .......................................................................................................................

c. f   ...................................................................................................................... 

Setelah kalian dapat menentukan nilai suatu fungsi trigonometri untuk suatu nilai x ,
sekarang saatnya kalian mempelajari grafik suatu fungsi trigonometri, bagaimana
menggambarnya, memperkirakannya dan menafsirkannya.

(i) Grafik Fungsi y  sin x
0
Untuk 0   360
x

x 0 30 45 60 90 120 135 150 180
1 1 1 1 1 1
sin x 0 2 3 1 3 2 0
0
2 2 2 2 2 2

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