Question

Cos a - sin (-a) * ctg(- a)

Answer 1

Ответ:0

Пошаговое объяснение:

Cos a -sin(-a)*ctg(-a)=cos(a)+sin(a)*ctg(-a)=cos(a)-sin(a)*ctg(a)=cos(a)-sin(a)*cos(a)/sin(a)=cos(a)-cos(a)=0

Answer 2

Правильный ответ будет 0

Answer 3

Let's break down the expression step by step:

1. cos a: This represents the cosine of angle 'a'.

2. sin (-a): This represents the sine of the negative of angle 'a'. The sine function is an odd function, meaning that sin(-x) = -sin(x).

3. ctg(-a): This likely represents the cotangent of the negative of angle 'a'. The cotangent function is the reciprocal of the tangent function: ctg(x) = 1/tan(x). Since tan(-x) = -tan(x), then ctg(-x) = 1/(-tan(x)) = -ctg(x).

So, putting it all together:

cos a - sin(-a) * ctg(-a)

= cos(a) - (-sin(a)) * (-ctg(a)) = cos(a) + sin(a) * ctg(a)

This is the simplified form of the expression. Keep in mind that ctg(x) is not a commonly used notation; the more common notation is cot(x), which is the reciprocal of the tangent function.