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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
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baldymcgee6
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just put in a value for x and see if it is true.
Spectrum
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i can't do c
Spectrum
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whenever i try to input values it never works
Spectrum
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that was helpful
.UserNotFound.
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XD
Spectrum
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can you please help me ?
vivifang
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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
Spectrum
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a ..... not b ..okay what about c and D?
RadEn
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c. correct to
RadEn
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d. correct