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Spectrum
Group Title
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
Spectrum Group Title
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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baldymcgee6 Group TitleBest ResponseYou've already chosen the best response.0
just put in a value for x and see if it is true.
 one year ago

Spectrum Group TitleBest ResponseYou've already chosen the best response.0
i can't do c
 one year ago

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

omnomsBESTfriend Group TitleBest ResponseYou've already chosen the best response.0
.
 one year ago

Spectrum Group TitleBest ResponseYou've already chosen the best response.0
that was helpful
 one year ago

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

vivifang Group TitleBest 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

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

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

RadEn Group TitleBest ResponseYou've already chosen the best response.0
c. correct to
 one year ago
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