If sinA+sin3A=cos2A then prove that cos6A-4cosA+8cos2A=4. answer me quick
YASH3100:
Well I think that the question is incomplete or is wrong I'm not sure but pls check it once whether it's correct or not
its correct
i have done already
Okkk
okk
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change cos2A into sinA and then which value you get then take it equation one after that which u have to prove come on it now there are all in cos let it change into sin u know the formula cos(90-A) is the formula after putting it which are cutting cut them and which u have get value from give use in it and surely you will get. the answer I do my trigonometry by this way which makes me easy if u like my idea then tell me
can i see your solutions...or..how u solve them maybe?...I am having some difficulty with understanding I guess.
okk
yea thanx
wlcm
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