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

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baldymcgee6Best ResponseYou've already chosen the best response.0
just put in a value for x and see if it is true.
 one year ago

SpectrumBest ResponseYou've already chosen the best response.0
whenever i try to input values it never works
 one year ago

SpectrumBest ResponseYou've already chosen the best response.0
can you please help me ?
 one year ago

vivifangBest ResponseYou've already chosen the best response.0
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
 one year ago

vivifangBest ResponseYou've already chosen the best response.0
Answer is A http://www.wolframalpha.com/input/?i=+sin8x+%3D+2sin4x+cos4x
 one year ago

SpectrumBest ResponseYou've already chosen the best response.0
a ..... not b ..okay what about c and D?
 one year ago
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