2син+7син+4сос-3кос

To simplify the expression, we can combine like terms:

2sin + 7sin + 4cos - 3cos

Since 2sin and 7sin are both sin terms, we can add them together:

2sin + 7sin = 9sin

Similarly, since 4cos and -3cos are both cos terms, we can add them together:

4cos - 3cos = 1cos or simply cos

So, the simplified form of the expression is:

9sin + cos