What is expand 3cos(pi/4 (x+2))-1 ?

The solution to expand 3cos(pi/4 (x+2))-1 is -3sin((pix)/4)-1

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expand 3cos(pi/4 (x+2))-1

expand

3 cos (\frac{π}{4} (x + 2)) - 1

- 3 sin (\frac{π x}{4}) - 1

Solution steps

3 cos (\frac{π}{4} (x + 2)) - 1

3 cos (\frac{π}{4} (x + 2)) = - 3 sin (\frac{π x}{4})

= - 3 sin (\frac{π x}{4}) - 1

- (3 (1 - sin (θ)))

(4 + 3 i)^{9}

\frac{( x - 5 ) ( x + 1 )}{\frac{x}{x + 1}}

- 5 x^{2} y \cdot (- 3) x y

(x + i y)^{3}

What is expand 3cos(pi/4 (x+2))-1 ?
The solution to expand 3cos(pi/4 (x+2))-1 is -3sin((pix)/4)-1