Question

Cos(180-A)+sin(90-A)​

Answer 1

Ответ:cos (180+a)+sin(90-a)=-cos a+cos a=0

Объяснение:

Answer 2

Let's simplify the expression step by step:

1. cos(180 - A): We can use the angle subtraction formula for cosine, which states that cos(180 - x) = -cos(x).

   So, cos(180 - A) = -cos(A).

2. sin(90 - A): We can use the angle subtraction formula for sine, which states that sin(90 - x) = cos(x).

   So, sin(90 - A) = cos(A).

Now, let's substitute these results back into the original expression:

-cos(A) + cos(A)

Now, you can see that the two terms cancel each other out:

-cos(A) + cos(A) = 0

So, the simplified expression is equal to 0.