Q23 of 303 Page 4

Answer each of the following questions in one word or one sentence or as per exact requirement of the question:
If , then write the value of x + y + xy.

Given tan^-1 x + tan^-1 y =π/4

We know that

⇒ x + y = 1 – xy

⇒ x + y + xy = 1

∴ x + y + xy = 1

Answer each of the following questions in one word or one sentence or as per exact requirement of the question:

Write the value of cos^–1(cos 350°) – sin^–1(sin 350°).

Answer each of the following questions in one word or one sentence or as per exact requirement of the question:

Write the value of .

Answer each of the following questions in one word or one sentence or as per exact requirement of the question:

Write the value of cos^–1 (cos 6).

Answer each of the following questions in one word or one sentence or as per exact requirement of the question:

Write the value of .

Answer each of the following questions in one word or one sentence or as per exact requirement of the question:If , then write the value of x + y + xy.