Which is cos2 theta if

1. Show that Sin3 Theta - Cos2 Theta = (1 - Sin Theta)(4Sin^2 Theta + 2Sin Theta - 1).Without using a calculator, show that
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2. asked by Edwards
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Solve the following trigonometry identities.a) 1-cos2(theta) = sin(theta)cos(theta)/cot(theta) b)
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2. asked by Zoë
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knowing that 2(theta) can be written as theta + theta, find the expression for sin2(theta) and cos2(theta).Is it
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2. asked by Steve
3. 566 views
Find all values of [theta] in the interval 0°<=X<= 360° that satisfy the equation cos2[theta]-cos[theta]=0
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2. asked by Libby
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If sin theta=3/5,then find: 1. sin2 theta 2. cos2 theta
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2. asked by nash
3. 430 views
Trigonometry Questions1. Solve the equation sin2x+1=-2sinx for 0≤x≤2π 2. Solve the equation 7sin2x-4sin2x/cosx=-1 where
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2. asked by john
3. 980 views
Which is cos2 theta if sin theta = -2/sqrt13 and 180 < theta < 270?1. -(13/5) 2. -(5/13) 3. 5/13 4. 13/5 3?
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2. asked by Anonymous
3. 558 views
If cos2 theta = 1/3 and 0 is less than or equal to 2 theta and 2 theta is less than equal to pi, find cos theta
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2. asked by George
3. 399 views
Multiple Choice (theta) means the symbol 0 with the dash in it.1.)Which expression is equivalent to
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2. asked by HotMath
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Multiple ChoiceWhich expression is NOT equivalent to 1? (theta) means 0 with dash in it. A.)sin^2 (theta)+cot^2 (theta) sin^2
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2. asked by HotMath
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