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Solve

`7sin((\pi )/(5)x)=4`

for the four smallest positive solutions

`x=`

Solve

`4cos(2x)=3`

for the smallest positive solution. Give your answer accurate to at least two decimal places. The curve above is the graph of a sinusoidal function. It goes through the points

`(-7,-2)`

and

`(3,-2)`

. Find a sinusoidal function that matches the given graph. If needed, you can enter

`\pi =3.1416dots`

as 'pi' in your answer, otherwise use at least 3 decimal digits.