SOLUTION: I have been having trouble solving this problem, using trigonometric identities:
{{{ 1-2cos^2(x)=sin^4(x)-cos^4(x) }}}
I have to prove it is an identity, preferably using the lef
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Trigonometry-basics
-> SOLUTION: I have been having trouble solving this problem, using trigonometric identities:
{{{ 1-2cos^2(x)=sin^4(x)-cos^4(x) }}}
I have to prove it is an identity, preferably using the lef
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Question 611721: I have been having trouble solving this problem, using trigonometric identities:
I have to prove it is an identity, preferably using the left-hand side.
I would appreciate any help given.
Thank you!
You can put this solution on YOUR website! identity substitution and factoring (difference of squares)
___ [sin^2(x) + cos^2(x)] - 2 cos^2(x) = [sin^2(x) + cos^2(x)] [sin^2(x) - cos^2(x)]
consolidation of terms and identity substitution ___ sin^2(x) - cos^2(x) = 1 [sin^2(x) - cos^2(x)]
