**Prove that **

**Proof:**

To prove the above is the same as proving

Indeed, by the addition and subtraction formulae, we obtain:

which equals , which in turn equals

, that is,

.

Thus, the proof.

More later,

Nalin Pithwa

Mathematics demystified

**Prove that **

**Proof:**

To prove the above is the same as proving

Indeed, by the addition and subtraction formulae, we obtain:

which equals , which in turn equals

, that is,

.

Thus, the proof.

More later,

Nalin Pithwa

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