What is simplify-cos(180+a)+cos(a) ?

The solution to simplify-cos(180+a)+cos(a) is 2cos(a)

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simplify-cos(180+a)+cos(a)

simplify

- cos (18 0^{\circ} + a) + cos (a)

2 cos (a)

Solution steps

- cos (18 0^{\circ} + a) + cos (a)

Rewrite using trig identities

= - (- cos (a)) + cos (a)

Simplify

- (- cos (a)) + cos (a) : 2 cos (a)

= 2 cos (a)

cos (4 t - π) - sin (4 t - π)

csc (- x^{0})

sin (- n x) cos (- m x)

\frac{sin ( 2 x - 3 π )}{2 x - π}

sin (arccos (1 - \frac{y}{r}))

What is simplify-cos(180+a)+cos(a) ?
The solution to simplify-cos(180+a)+cos(a) is 2cos(a)