Half Angle Identities cosx =

Half Angle Identitiescosx = 7/25 greater than 270 deg and less than 360 Determine cos 1/2x a. -7rt2/10 b. 7rt2/5 c.7/25 d.-4/5 I
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2. asked by Don
3. 385 views
I can't seem to prove these trig identities and would really appreciate help:1. cosx + 1/sin^3x = cscx/1 - cosx I changed the 1:
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2. asked by Heather
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Trigonometric IdentitiesProve: (tanx + secx -1)/(tanx - secx + 1)= tanx + secx My work so far: (sinx/cosx + 1/cosx +
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2. asked by Dave
3. 1,447 views
Prove the following identities:13. tan(x) + sec(x) = (cos(x)) / (1-sin(x)) *Sorry for any confusing parenthesis.* My work: I
1. 2 answers
2. asked by Taylor
3. 1,065 views
Which of the following are trigonometric identities?(Can be more then one answer) tanx cosx cscx = 1 secx-cosx/secs=sin^2x
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2. asked by Jill
3. 4,793 views
Use the fundamental identities to simplify the expression.csc Q / sec Q so this would be 1/sinx / 1/cosx and then 1/sinx times
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2. asked by Hannah
3. 630 views
Use the fundamental identities to simplify the expression.csc Q / sec Q so this would be 1/sinx / 1/cosx and then 1/sinx times
1. 1 answer
2. asked by Hannah
3. 594 views
Use the fundamental identities to simplify the expression.csc Q / sec Q so this would be 1/sinx / 1/cosx and then 1/sinx times
1. 1 answer
2. asked by Hannah
3. 574 views
Proving identities:1) 1+ 1/tan^2x = 1/sin^2x 2) 2sin^2 x-1 = sin^2x - cos^2x 3) 1/cosx - cosx = sin x tan x 4) sin x + tan x
1. 3 answers
2. asked by Deepa
3. 764 views
Use the identities cos^2 x + sin^2 x =1and cos2x=cos^2 x -sin^2 x to show that cos^4 x -sin^4 x = cos2x Im not sure how, I can
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2. asked by Anon
3. 561 views