Question

The angle between the line x = y and x-axis in negative direction
(A) 105
(B) 120°
(C) 135
(D) 150°

ans plzz ...with full explanation....​

Answer 1

Step-by-step explanation:

Dear ,

The answer is option C ) 135

Answer 2

We know that cos

2

α+cos

2

β+cos

2

γ=1,

i.e., sum of the squares of the direcction cosines is unity,

Where α,β,γ are the angles made by a line with positive direction of the axes,

⟹

4

1

+cos

2

β+

4

1

=1

⟹cos

2

β=

2

1

cosβ=

2

1

or −

2

1

⟹β=45

0

or135

0