Question 897066
Any Sin function can only vary
between {{{ -1 }}} and {{{ +1 }}}
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{{{ 3 }}} times a sin function varies from
{{{ -3 }}} to {{{ +3 }}}
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{{{ 3*sin(2x-1)+pi }}} varies between
{{{ pi + 3 }}} and {{{ p - 3 }}}, so the amplitude is
{{{ pi + 3 - pi + 3 = 6 }}}