急! F4 Basic Trigonometry ex4

22a, For any sinx, the max value is 1 and min is -1.
Therefore max value of y is: 3 (when sin45) and min value is -3 (when sin135).
And the graph is like when it is sin45,reach3,when is 90,reach back 0,when
is 135 reach -3, when ís 180,reach back 0..... etc.
22b,max:3 min:-3
22c, is period since the graph repeats its values in regular intervals or periods,
the period is every 180 degree

23a,For any cos x, the max value is 1 and min is -1.
Therefore max value of y is: 1 (since -cos(x/2) , every 180 degree =original
90 degree, so, when it is x=360 degree)
min value of y is: -1 (when it is x=0 degree)
And the graph should be, when x=0, y=-1 ; when x=180,y=0;when x=360 ,y=1
;when x=540, y=0;when x=720,y=-1.
23b,max=1 min=-1
23c,It is a period since the graphrepeats its values in regular intervals or
periods,the period is every 720 degree.
24a,For any sinx, the max value is 1 and min is -1. But for sin^2 x , max is 1,
min is 0 (-1*-1=0)
There for when x=0, y=4, when x=90 y=7,when x=180 y=4, when x=270, y=7
When X=360 ,y=4.
24b,max=7 min=4
24c, It is a period since the graphrepeats its values in regular intervals or
periods,the period is every 180 degree.