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This solution is probably not what you had in mind, but could be helpful in some cases: since the values of sqrt(sin(x)) for parts of this range are complex, a possible visualization of it is

complex_plot(sqrt(sin(x)), (0, 10), (-1, 1))

This is a strip around the range you are interested in. Here is an explanation of the output, from sage manual:

The magnitude of the output is indicated by the brightness (with zero being black and infinity being white) while the argument is represented by the hue (with red being positive real, and increasing through orange, yellow, ... as the argument increases).

This page demonstrates and explains some complex plots.

This solution If you only want to get read of the part where sin(x) is probably not what negative you had in mind, but could be helpful in some cases: can use

maxima.plot2d(sqrt(sin(x)),[x,0,10])

instead - maxima detects this correctly.

However, since the values of sqrt(sin(x)) for parts of this range are in these places complex, a possible possibly better visualization of it is

complex_plot(sqrt(sin(x)), (0, 10), (-1, 1))

This is a strip around the range you are interested in. Here is an explanation of the output, from sage manual:

The magnitude of the output is indicated by the brightness (with zero being black and infinity being white) while the argument is represented by the hue (with red being positive real, and increasing through orange, yellow, ... as the argument increases).

This page demonstrates and explains some complex plots.

If you only want to get read of the part where sin(x) is negative you can use

maxima.plot2d(sqrt(sin(x)),[x,0,10])

instead (write this in sage - it has a maxima detects this correctly.interface built in).

However, since the values of sqrt(sin(x)) in these places complex, a possibly better visualization of it is

complex_plot(sqrt(sin(x)), (0, 10), (-1, 1))

This is a strip around the range you are interested in. Here is an explanation of the output, from sage manual:

The magnitude of the output is indicated by the brightness (with zero being black and infinity being white) while the argument is represented by the hue (with red being positive real, and increasing through orange, yellow, ... as the argument increases).

This page demonstrates and explains some complex plots.

If you only want to get read rid of the part where sin(x) is negative you can use

maxima.plot2d(sqrt(sin(x)),[x,0,10])

(write this in sage - it has a maxima interface built in).

However, since the values of sqrt(sin(x)) in these places complex, a possibly better visualization of it is

complex_plot(sqrt(sin(x)), (0, 10), (-1, 1))

This is a strip around the range you are interested in. Here is an explanation of the output, from sage manual:

The magnitude of the output is indicated by the brightness (with zero being black and infinity being white) while the argument is represented by the hue (with red being positive real, and increasing through orange, yellow, ... as the argument increases).

This page demonstrates and explains some complex plots.

If you only want to get rid of the part where sin(x) is negative you can use

maxima.plot2d(sqrt(sin(x)),[x,0,10])

(write this in sage - it has a maxima interface built in).

However, since the values of sqrt(sin(x)) in these places are complex, a possibly better visualization of it is

complex_plot(sqrt(sin(x)), (0, 10), (-1, 1))

This is a strip around the range you are interested in. Here is an explanation of the output, from sage manual:

The magnitude of the output is indicated by the brightness (with zero being black and infinity being white) while the argument is represented by the hue (with red being positive real, and increasing through orange, yellow, ... as the argument increases).

This page demonstrates and explains some complex plots.