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d f(x) / dx = -3cos3x
increasing for dy/dx > 0
- 3cos3x > 0
cos3x < 0
No interval in (0,pie/2)
for decreasing, cos3x > 0
3x belongs to 0 to π/2
x belongs to 0 to π/6
increasing for dy/dx > 0
- 3cos3x > 0
cos3x < 0
No interval in (0,pie/2)
for decreasing, cos3x > 0
3x belongs to 0 to π/2
x belongs to 0 to π/6
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