```
Question. " + " is
```
- binary operation on R
- not a binary operation on R
- a binary operation in Qc
- not a binary operation in E

```
Question. (22 1/2)° =
```
- π/2 radians
- π/4 radians
- π/8 radians
- 180π radians

```
Question. (A ∪ B) ∪ C =
```
- A ∩ (B ∪ C )
- A ∪ (B ∪ C )
- π
- A ∪ (B ∪ C )

```
Question. (A n B) n C =
```
- A n (B n C )
- A ∪ (B ∪ C )
- π
- A ∪ (B ∪ C )

```
Question. (cos(x)-cos3x)/(sin3x-sin(x)) =
```
- cot2x
- tan2x
- csc2x
- sec2x

```
Question. (n+1)n(n-1)/3.2.1 =
```
- (n+1)ι
- 3ι(n-2)ι/(n+1)ι
- (n+1)ι/3ι(n-2)ι
- (n-2)ι

```
Question. (n+2)(n+1)n =
```
- nι
- (n+2)ι
- (n-1)ι/(n+2)ι
- (n+2)ι/(n-1)ι

```
Question. (secθ-tanθ)² =
```
- 1 + sinθ/1 - sinθ
- (1 - sinθ)/(1 + sinθ)
- (1 - cosθ)/(1+cosθ)
- cscθ

```
Question. (x+2)² = x² + 4x + 4 is
```
- a linear equation
- cubic equation
- an identity
- an euation

```
Question. * is said to be commutative in A for all a,b ε A
```
- a + b = b + a
- a * b = b * a
- a - b = b - a
- a * b ≠ b * a

```
Question. [ 0 0 0 ] is
```
- Scaler matrix
- diagonal matrix
- identity matrix
- null matrix

```
Question. [ a b c ] is a
```
- zero matrix
- diagonal matrix
- column matrix
- row matrix

```
Question. { - 3 n : n ε Z } IS an abelian group under
```
- subtraction
- division
- multiplication
- addition