**Problem.**

If lie on the unit circle , then value of

is

(a) 0

(b) n

(c) -n

(d) none of these.

**Solution.**

As lie on the circle , for

Thus, for

Hence, , which in turn equals

, that is,

.

(since ).

**Answer. Option a.**

More later,

Nalin Pithwa

Mathematics demystified

**Problem.**

If lie on the unit circle , then value of

is

(a) 0

(b) n

(c) -n

(d) none of these.

**Solution.**

As lie on the circle , for

Thus, for

Hence, , which in turn equals

, that is,

.

(since ).

**Answer. Option a.**

More later,

Nalin Pithwa

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