1,063 Answered Questions for the topic Pre-Calculus

Pre Calculus

05/04/15

2 cos^2 (45°-x)=1+sin@a)
Please help
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Pre Calculus

05/04/15

tan A + cot A = 2csc(2A)
I am so lost
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Pre Calculus

05/04/15

What is the period of f(x) = cot(4x)+7
I am so confused please help
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Pre Calculus

05/04/15

Find the exact value of sin(p/12). Use the half-angle formula.
Please help
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Pre Calculus

05/04/15

What is the exact value of arccos (cos(3p/2) )
I am so lost please help
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Pre Calculus

05/04/15

Suppose the value of the U.S. dollar decreases 3.1% per year. Find the value of a U.S. dollar, to the nearest cent, in 6.5 years.
 Using the A=Pert formula of increasing and decreasing 
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Pre Calculus

04/30/15

Find sin 2x, cos 2x, and tan 2x from the given information: sin x = -5/13 , x in Quadrant III, sin 2x = cos 2x = tan 2x =
I need help
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Pre Calculus

04/30/15

Find sin 2x, cos 2x, and tan 2x from the given information: tan x = - 4/3 , x in Quadrant II, sin 2x = cos 2x = tan 2x =
Help me 
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Pre Calculus

04/30/15

Find sin 2x, cos 2x, and tan 2x from the given information: sin x = 3/5 , x in Quadrant I, sin 2x= , cos 2x= , tan 2x= ,
I am so lost
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Pre Calculus

04/30/15

Use an Addition or Subtraction Formula to find the exact value of the expression: tan 285°
I am so confused
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Pre Calculus

04/30/15

Use an Addition or Subtraction Formula to find the exact value of the expression: tan 105°
I need help
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Pre Calculus

04/30/15

Use an Addition or Subtraction Formula to find the exact value of the expression: cos 255°
Help me please
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Pre Calculus

04/30/15

Use an Addition or Subtraction Formula to find the exact value of the expression: sin 255°
Please help
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Pre Calculus

04/30/15

Write the trigonometric expression in terms of sine and cosine, and then simplify. cos u + tan u sin u
I really need help please and thanks 
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Pre Calculus

04/30/15

Write the trigonometric expression in terms of sine and cosine, and then simplify. cot ? sec ?
I need help I'm confused
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Pre Calculus

04/30/15

Write the trigonometric expression in terms of sine and cosine, and then simplify. sin ? sec ?
help please
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Pre Calculus

04/28/15

sec x = 11.7/4.5 and 0<x<pi/2, find sin (x/2)
I am confused on how to do this. 
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Pre Calculus

04/28/15

Prove the identities vsecx- tanx/secx+tanx = 1/secx+tanx
help me 
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Pre Calculus

04/28/15

Prove the identities sinx/1 + cosx =1-cosx/sinx
Please help
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Pre Calculus

04/28/15

Prove the identities sec^2 ? csc^2 ? = sec^2 + csc^2 ?
These confuse me so much 
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Pre Calculus

04/28/15

Prove the identities tan ? + cot ? = csc ?/cos ?
So lost 
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Pre Calculus

04/28/15

tan ?+ 2 cot ? = (sin^2 ? + 2 cos^2 ?)/( sin ? cos ?)
I am so confused
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Pre Calculus

04/28/15

Prove the identities cos? csc?=cot?
I'm so lost 
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Pre Calculus

04/28/15

Prove the following identities sec x/(cot x + tan x)=sin x
Need help please
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Pre Calculus

04/28/15

Explain the difference between sin^-1(x) and 1/sin(x), Are there different expressions for both these functions?
I am kind of confused 
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