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{SECT 0 {EXCHG {PARA 0 "" 0 "" {TEXT -1 36 "Practices on Trigonometric
 Functions" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{EXCHG {PARA 0 "" 0 "" 
{TEXT -1 144 "Exercise 1: If  f(x) = tan (x). (i) Solve tan(x) = -1/sq
rt(3) algebraically by hand. (ii) Use the graph of y = f(x) to solve t
an(x) = -1/sqrt(3)" }}{PARA 0 "" 0 "" {TEXT -1 14 "Solution: (ii)" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 13 "f:=x->tan(x);" }}}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 35 "plot(f(x),x=-2*Pi..2*Pi,y=-10..10);
" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 11 "f(Pi-Pi/6);" }}}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 13 "f(2*Pi-Pi/6);" }}}{EXCHG {PARA 0 "
" 0 "" {TEXT -1 151 "Exercise 2. page 171, #74. If  y1 = sin(x)  and  \+
y2 = sqrt(3)/2. Then (i) solve  y1 = y2 by hand,  (ii)  use the graphs
 of  y1 and  y2 to solve y1=y2. " }}}{EXCHG {PARA 0 "> " 0 "" 
{MPLTEXT 1 0 47 "plot(\{sin(x),sqrt(3)/2\},x=-2*Pi..2*Pi,y=-1..1);" }}
}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 10 "sin(Pi/3);" }}}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 13 "sin(Pi-Pi/3);" }}}{EXCHG {PARA 0 "
" 0 "" {TEXT -1 80 "Exercise: What are two intersections for y1=y2  ab
ove when  x  is in [-2*Pi, 0]?" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "
" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}}}{MARK "6 0 0" 96 }
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