What is expand (2sin(x)+1)(sin(x)-1) ?

The solution to expand (2sin(x)+1)(sin(x)-1) is -sin(x)-cos(2x)

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expand (2sin(x)+1)(sin(x)-1)

expand

(2 sin (x) + 1) (sin (x) - 1)

- sin (x) - cos (2 x)

Solution steps

(2 sin (x) + 1) (sin (x) - 1)

Apply FOIL method

(2 sin (x) + 1) (sin (x) - 1) : - sin (x) - cos (2 x)

= - sin (x) - cos (2 x)

(3 x^{2} - 4 x + 1)^{5}

\frac{( 2 x + 3 ) ^{3}}{6}

(- 3 + i)^{7}

(2 cos (x) - 1)^{2}

, x (x^{2} + y^{2})

What is expand (2sin(x)+1)(sin(x)-1) ?
The solution to expand (2sin(x)+1)(sin(x)-1) is -sin(x)-cos(2x)