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5.
sin²(π/3 -x) -sin(5π/6 -x)
=cos²[π/2-(π/3 -x)]-sin[π-(5π/6 -x)]
=cos²(x+ π/6)-sin(x+π/6)
=1-sin²(x+ π/6)-sin(x+π/6)
=1-(-3/5)²-(-3/5)
=31/25
sin²(π/3 -x) -sin(5π/6 -x)
=cos²[π/2-(π/3 -x)]-sin[π-(5π/6 -x)]
=cos²(x+ π/6)-sin(x+π/6)
=1-sin²(x+ π/6)-sin(x+π/6)
=1-(-3/5)²-(-3/5)
=31/25
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