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which of the following are identities? a. sin8x = 2sin4x cos4x b.(sinx-cosx) ^2 = 1 + sin2x c. (1-tan^2x)/2tanx = 1/ tan2x d. (sinx +sin5x)/ (cosx+ cos5x) = tan3x

Mathematics
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just put in a value for x and see if it is true.
i can't do c
whenever i try to input values it never works

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Other answers:

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that was helpful
XD
can you please help me ?
The answer can't B (sinx - cosx)^2 = (sinx)^2 - 2sinxcosx + (cosx)^2 (sinx)^2 + (cosx)^2 = 1; 2sinxcosx = sin2x therefore, (sinx - cosx)^2 = 1- sin2x
Answer is A http://www.wolframalpha.com/input/?i=+sin8x+%3D+2sin4x+cos4x
a ..... not b ..okay what about c and D?
c. correct to
d. correct

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