#y=1-sinx# is your #y=sinx# graph flipped on its x-axis (referring to the negative in front of #sinx#) and shifted up by 1 unit (referring to the 1 in front of #-sinx#

Below is your #y=sinx#

graph{sinx [-10, 10, -5, 5]}

Below is your #y=-sinx#. Notice that it is flipped on its x-axis. Another way you can know that it has flipped on its x-axis is by subbing any value into #y=sinx# and #y=-sinx# and you will notice that the y-value is the same but the sign is different

graph{-sinx [-10, 10, -5, 5]}

Below is your #y=1-sinx#. Notice that it is your #y=-sinx# but shifted upwards by 1 unit

graph{1-sinx [-10, 10, -5, 5]}