What is simplify-4.5cos(3x-pi/8) ?

The solution to simplify-4.5cos(3x-pi/8) is -4.5(0.92387…cos(3x)+0.38268…sin(3x))

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simplify-4.5cos(3x-pi/8)

simplify

- 4.5 cos (3 x - \frac{π}{8})

- 4.5 (0.92387 \dots cos (3 x) + 0.38268 \dots sin (3 x))

Solution steps

- 4.5 cos (3 x - \frac{π}{8})

Rewrite using trig identities

= - 4.5 (\frac{2 + 2}{2} cos (3 x) + \frac{2 - 2}{2} sin (3 x))

Simplify

\frac{2 + 2}{2} cos (3 x) + \frac{2 - 2}{2} sin (3 x) : 0.92387 \dots cos (3 x) + 0.38268 \dots sin (3 x)

= - 4.5 (0.92387 \dots cos (3 x) + 0.38268 \dots sin (3 x))

cos (\frac{π}{2} + φ)

cos (9 0^{\circ}) + cos (- 2 A)

sec (arccos (\frac{u}{v}))

\frac{h}{tan ( 4 0 ^{\circ} )} - 50

sin (θ + 3 0^{\circ})

What is simplify-4.5cos(3x-pi/8) ?
The solution to simplify-4.5cos(3x-pi/8) is -4.5(0.92387…cos(3x)+0.38268…sin(3x))