Prove that
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straightforward, just use the formula for
I've never done this type question before, could you post how its done please. I know I have to use the formula but how is it done?
So what is x and y? Is it and ?
Originally Posted by gary223 So what is x and y? Is it and ?
Originally Posted by skeeter Okay, I see. So whats the next step? Do I cancel some parts out or do I calculate each part? Or is that the question finished?
Originally Posted by gary223 Okay, I see. So whats the next step? Do I cancel some parts out or do I calculate each part? Or is that the question finished? substitute in the value of .
Originally Posted by skeeter So its Correct?
Originally Posted by gary223 So its Correct? look again at what you were trying to prove ...
Originally Posted by skeeter look again at what you were trying to prove ... ??? EDIT: Or is it:
Or is it Sorry for double post but I wanna get this.
you were asked to prove that Krizalid gave you the sum identity for tangent ... my initial post basically told you to substitute for and for ... using the fact that ... the original equation is proved ... you're done.
Wow, it seems so easy once you do it. Thanks.
Note that special angles exist, which are basically, sine, tangent and cosine of 30, 45, 60and 90. And you are required to recognise them..
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