Question

Sin(-30°)+cos(-60°)=

Answer 1

Sin(-30°)=-1/2

Cos(-60)=1/2

-1/2+1/2=0

Answer 2

-1/2 + 1/2 - 3*(-√3/3)*(-√3/3)= -1

Answer 3

To calculate the values of sine and cosine for negative angles, we can use the following trigonometric identities:

1. sin(-θ) = -sin(θ)
2. cos(-θ) = cos(θ)

Let's apply these identities to calculate the given expression:

sin(-30°) + cos(-60°)

Using identity 1: sin(-30°) = -sin(30°)

Using identity 2: cos(-60°) = cos(60°)

Now, we need to find the values of sin(30°) and cos(60°). These are commonly known trigonometric values:

sin(30°) = 0.5 cos(60°) = 0.5

Now, we can substitute these values back into the expression:

-sin(30°) + cos(60°) = -0.5 + 0.5 = 0

So, Sin(-30°) + cos(-60°) equals 0.