Question 1082268
{{{ 7*sin^2(x) - 14*sin(x) + 2 = -5 }}}
{{{ 7*sin^2(x) - 14*sin(x) = -7 }}}
{{{ sin^2(x) - 2*sin(x) = -1 }}}
{{{ sin^2(x) - 2*sin(x) + 1 = 0 }}}
{{{ ( sin(x) - 1 )^2 = 0 }}}
{{{ sin(x) = 1 }}}
{{{ x = pi/2 }}}
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The general solution would be:
{{{ ( 4n + 1 )*( pi/2 ) }}}
( n = 0,1,2,3,4,5, . . .  )