266 Answered Questions for the topic trigonometric identities

Trigonometric Identities

11/10/15

Finding the angles of a sine function.

Let again t be the angle between 0 and \frac{\pi}{2} such thatsin t = 1/4Then cos (t+pi) = . sin(t-pi) = . cos (t+2pi) = . tan (t+pi) =
Trigonometric Identities Algebra 2 Trigonometry Angle

11/04/15

area of triangle w/ algebra

how do you find the angle of a triangle with sides (6u-1) and (1u) and an area of 5cm^2 ?      there was a question like this in a test i did but i couldn't work out the answer.. help?
Trigonometric Identities

11/03/15

Simplify completely into an expression with sin (A) or cos (A) only:

1 - (sin(A) + cos(A))^2
Trigonometric Identities

11/02/15

Complete the following fundamental identities:

1. Reciprocal Identity: csc (A) =  2. Reciprocal Identity: cot (A) = 3. Ratio Identity: cot (A) =  4. Pythagorean Identity = 1 - cos^2(A) = 5. Pythagorean Identity = 1 +tan^2(A) =
Trigonometric Identities

11/01/15

Write each expression in terms of sines and/or cosines and then simplify:

1. sec (x) / tan(x)    2. sin (x) / csc (x) + cos ^2 (x)   3. sin (x) / csc (x) - sec (x)cos (x)
Trigonometric Identities

11/01/15

Write sec t in terms of tan t if t is in quadrant II: sec t =A sqrt{B+C^2}, the sign A (input + or -) is ; the constant B is ; the function C is

I need to see all the steps for this question so I could be able to it on my own next time. Show me in full detail of how you arrive at the answer. You have to find the sign A (input + or -) ; the... more
Trigonometric Identities

10/27/15

prove identity

(1/sinx + 1/cosx)/(1/sinx - 1/cosx) = (cos2x-sin2x)/1-2cosxsinx)
Trigonometric Identities Precalculus

10/22/15

How do I distribute (cosxcotx)(secx-tanx)?

How do I distribute (cosxcotx)(secx-tanx)?
Trigonometric Identities Trigonometry

10/20/15

1+cos2x-cos^2x =cos^2x

i know that cos(a-b) = cosacosb+sinasinb And cos(a+b) = cosacosb-sinasinb   and cos(x+x) = cos^2x-sin^2x
Trigonometric Identities

09/24/15

cos(x)tan^4(x)

Use a power reducing identity to rewrite the following expression below in terms containing only first powers of cosine   Ive been working on this one for a minute and i keep getting... more
Trigonometric Identities Trigonometry Pre Calculus

09/09/15

Simplify the expression. 5 -tan(?)/ 5csc(?) - sec (?)

I know you are supposed to us the trig identities, but I have know idea where to even begin.
Trigonometric Identities Math Mathematics

09/01/15

Math- Trigonometric Identities

Prove that tan(45+x) is identical to 2tan(45-x)   Please show all your working    Thanks in advance for your help!

07/15/15

solutions of the equation that are in the interval [0, 2p)0.[sinx +cos x = 0 ]

not seeming to get this problem
Trigonometric Identities

05/27/15

How do double angle identities work? (Trigonometry)

I don't understand how to do maths mostly because I don't understand why formulae works they way they do or the reasoning behind equations and etc. I tried explain the (sin 2 theta) double-side... more
Trigonometric Identities

05/15/15

trigonometric identities

Use trigonometric identities to find the exact value of tan(5π/8).
Trigonometric Identities

05/15/15

trigonometric identities

Use trigonometric identities to find the exact value of cos(5π/8).
Trigonometric Identities

05/08/15

If cosx=2/3 abd x is in quadrant 4 find sin(x/2)

a) -1/3 b) 1/3 c) - sqrt1/6 d) sqrt1/6   I think it is either c or d.  I'm confused on whether it is negative or positive.  If it is in quadrant 4, wouldn't y be negative?  C?     2) If... more
Trigonometric Identities

05/08/15

Find the exact value of cos(11p/8)

Find the exact value of cos(11p/8)A) √(2+√2)/4B) √(2-√2)/4C) - √(2-√2)/4D) -√(2+√2)/4     I think it is either c or b       To solve the equation 3sin(2x)=5cosx you should rewrite it as: a)... more
Trigonometric Identities

05/07/15

Find the exact value of cos(11p/8)

A) √(2+√2)/4 B) √(2-√2)/4 C) - √(2-√2)/4 D) -√(2+√2)/4         2) 1 + cos (12x)=   a)2cos^2(12x) b) 2sin^2(12x) c)2cos^2(6x) d) 2sin^2(6x)  
Trigonometric Identities

05/07/15

All trigonometric equations are identities. true or false?

1Alltrigonometric equations are identities. true or false?   My answer: false   2   cos a/2= +/- √(1-cosa)/2   True or false?  False?   3 fill in the blank   -------... more
Trigonometric Identities

05/07/15

tan^2x+sec^2x=1 true or false? for ALL values of x

tan^2x+sec^2x=1 true or false? for all values of x   2) cos2a=2cos^2a-1 for ALL values of a  true or false?    3) sin(-x)=-sinx for all values of x true or false?     
Trigonometric Identities

05/07/15

tan^2x+sec^2x=1 true or false? for all values of x

tan^2x+sec^2x=1 true or false?  for all values of x Uhm I think false?      tan^2 x+1=sec^2x.  So to get 1 on the other side of the equal sign wouldn't it be sec^2x-tan^2x=1?   I'm very... more
Trigonometric Identities

05/03/15

sin theta + sin 3 theta = tan theta sec theta

sin theta + sin 3 theta = tan theta sec theta  Show that the right side equals the left side
Trigonometric Identities

04/28/15

Verify csc^2x - 1

please show me any steps you are able to
Trigonometric Identities

04/27/15

establish identity 1-cos(2x)=tan(x)sin(2x)

establish identity   1-cos(2x)=tan(x)sin(2x)   (1+cosθ)tan θ/2 =sinθ

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