How can i show that
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Originally Posted by maths900 How can i show that Formula Now its better if you try it and ask incase of further troubles
Originally Posted by maths900 How can i show that this is not an identity! for example it's not true if in order to make it an identity we need to be in the quadrant 1 or 4, where cosine is positive. the proof then is very easy. just use the identities: and
Hello, Originally Posted by maths900 How can i show that Hence So Then ---> Now you have to see in which quadrant is... Originally Posted by ADARSH Formula Now its better if you try it and ask incase of further troubles A cosine or a sine can be negative...
Hello, maths900! We need the double-angle identities: . . . . Show that: . The left side is: . . . . . . . . . . . . . .
Thanks everyone, thought i'd have to use the double angle identities but i'm not as good with them as you guys are, thank you
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