What is simplify-cos(3x-45) ?

The solution to simplify-cos(3x-45) is -(sqrt(2)cos(3x)+sqrt(2)sin(3x))/2

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simplify-cos(3x-45)

simplify

- cos (3 x - 4 5^{\circ})

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

Solution steps

- cos (3 x - 4 5^{\circ})

Rewrite using trig identities

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

y sin (- cos (x - y))

tan (18 0^{\circ} - α)

cos (x) csc (9 0^{\circ} - x)

\frac{e ^{t} y}{1 + tan ^{2} ( y )}

sin (arccos (- \frac{1}{p}))

What is simplify-cos(3x-45) ?
The solution to simplify-cos(3x-45) is -(sqrt(2)cos(3x)+sqrt(2)sin(3x))/2