10 SCREEN 12
20 PRINT "                Integration by trigonometric substitution"
30 PRINT "         "; CHR$(244)
40 PRINT "Evaluate "; CHR$(245); "1/"; CHR$(251); "(9-x^2) dx"
50 PRINT "Substitute x=3sin("; CHR$(233); ")"
60 PRINT "dx=3cos("; CHR$(233); ")d"; CHR$(233)
70 PRINT CHR$(244); "              "; CHR$(244)
80 PRINT CHR$(245); "1/"; CHR$(251); "(9-x^2) dx="; CHR$(245); "3cos("; CHR$(233); ")d"; CHR$(233); "/"; CHR$(251); "9-9sin^2("; CHR$(233); ")"
90 PRINT " "; CHR$(244)
100 PRINT "="; CHR$(245); "3cos("; CHR$(233); ")d"; CHR$(233); "/"; CHR$(251); "(9cos^2("; CHR$(233); ")"
110 PRINT " "; CHR$(244)
120 PRINT "="; CHR$(245); "d"; CHR$(233)
130 PRINT "="; CHR$(233)
140 PRINT "=arcsin(x/3)+C"
150 SYSTEM