Question:

Use the symmetric and periodic properties of the sine, cosine and tangent functions to establish the following results.

Attempt:

I don't know how to start

Results 1 to 2 of 2

- Apr 12th 2008, 01:34 AM #1

- Apr 12th 2008, 02:05 AM #2
Hello,

For the first one, there are two ways imho :

- sketch a trigonometrical circle and you will see that this relation is true

- use the formula sin(a-b)=sin(a)cos(b)-sin(b)cos(a)

For the second one, use the periodicity :

- the sine function is 360-periodic. Hence

- As the sine function is an odd function, sin(-x)=-sin(x)

- and you retrieve the first relation

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