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prove that (sin3x+cos3x)^2 = 1+sin6x (an identity )
please can someone help I'm really struggling
please can someone help I'm really struggling
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#2
(Original post by jessiepip)
prove that (sin3x+cos3x)^2 = 1+sin6x (an identity )
please can someone help I'm really struggling
prove that (sin3x+cos3x)^2 = 1+sin6x (an identity )
please can someone help I'm really struggling
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(Original post by davros)
OK so first expand the bracket on the left as if you were doing (A+B)^2
OK so first expand the bracket on the left as if you were doing (A+B)^2
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#4
(Original post by jessiepip)
okay, thank you , i've done that and I've then simplified some of it down and i ended up with 3+ sin6x , I'm not sure where I've gone wrong or how to get the +1
okay, thank you , i've done that and I've then simplified some of it down and i ended up with 3+ sin6x , I'm not sure where I've gone wrong or how to get the +1
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