66 Answered Questions for the topic Trig Identities

03/29/19

#### Solve the equation. Cos^2θ-sin^2θ=1+sinθ on the interval 0<θ<2π

Please help! This is for my precal class test review and I’ve been trying to solve it for an hour now and can’t seem to figure out how to do it. Here is the problem once again: cos2θ-sin2θ=1+sinθ...
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02/12/18

#### tan^2x - sin^2x = sin^2x • tan^2x

I don’t know how to figure out this proof. the only relationship i can think of is tan = sin/cos

01/31/18

#### Turing Trig Expression into Algebraic Expression

I have no idea how to turn this into an algebraic expression, please help ASAP!
Please give me tips on how to do this with other trig to algebraic expressions, as I have four problems I am quite...
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12/03/17

#### I don't understand what this trig problem is asking!!!!!! Can provide more info if needed

If csc(α) = 3, where 0 < α < π/2, and β is a Quadrant II angle with tan(β) = −7, find
cos(α+β)
And there are others that I'm supposed to find, such as sin(α+β), but this is just the...
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10/03/17

#### What is the exact value of Sin (380) degrees?

I know how to solve these when it involves actual angles from the unit circle, but I can't seem to find it for those angles not on the unit circle.

05/25/17

#### 5tanx = 2sin2x solve for interval (0 2π)

5tanx = 2sin2x solve for interval (0 2π)algebraic means without calculator

05/25/17

#### cos2x = cosx solve for interval (0 2π)

cos2x = cosx solve for interval (0 2π)
algebraic means without calculator

05/25/17

#### 5tanx = 2sinsx solve for interval (0 2π)

5tanx = 2sinsx solve for interval (0 2π)
algebraic means without calculator

05/25/17

#### sin x- sq root 3 cosx = 0 solve for interval (0 2π)

sin x- sq root 3 cosx = 0 solve for interval (0 2π)
algebraic means without calculator

05/25/17

#### sin4x - sin2x = 0 solve for interval (0 2π)

sin4x - sin2x = 0 solve for interval (0 2π)
algebraic means without calculator

05/25/17

#### sin (x/2) = 1- cosx solve for interval (0 2π)

sin (x/2) = 1- cosx solve for interval (0 2π)
algebraic means without a calculator

05/25/17

#### prove (sinx+siny)/(cosx-cosy) = -cot(x-y/2)

(sinx+siny)/(cosx-cosy) = -cot(x-y/2)
use left as given

05/25/17

#### prove sinxcosy = (1/2)(sin(x+y)+sin(x-y))

sinxcosy = (1/2)(sin(x+y)+sin(x-y))
left side is the given

05/25/17

#### prove (1+cosx)/(sinx) + (sinx)/(1+cosx) = 2cscx

(1+cosx)/(sinx) + (sinx)/(1+cosx) = 2cscx
use left side as given

03/09/17

#### Proving Trig Identity

I'm having trouble trying to prove this trig identity. Help is greatly appreciated. Thanks in advance. 1/(csc-cot) = (1+cos)/sin

12/03/16

#### Simple Trig, got lost and need help.

Solve the given equation over the interval [0,2): 2sinx+ (sqrt 3) sin^2x=-(sqrt 3) cos^2x
A. x=0, and x=(pi/2), and x=(3 pi/2), and x=2(pi)x=(3 pi/2), and x=(7 pi/2)
b. x=(4 pi/3) and x=(5...
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