+0  
 
0
433
1
avatar

Hello everyone, I already have answers to the three questions I'm asking but I just want to make sure I am right, Thank you for checking my answers.

 

1. What is the exact value of the trigonometric expression?

tan(7π4)

 

2√2

1

−2√2

−1

 

My answer= -1

 

2. What is the exact value of the trigonometric expression in simplest form?

sin(5π6)+2tan(7π4)

 

32

12+2√

12−2√

−32

 

My answer= -3/2

 

3. 

θ  lies in Quadrant II .

cosθ=−811cosθ=−811

What is the exact value of sinθ in simplified form?

 

−57√11

57√11

857√57

811

 

My answer= Honestly, for this one, I have no idea. Help me out?

Guest Jan 13, 2018
 #1
avatar+88899 
+2

First one is good

 

Second is good, too

 

cos θ  =  -8/11

 

We need to find  y  .....since we are in Quad II, it will be positive   =   

√ [  11^2  - (-8)^2  ]  =  √ [ 121 - 64 ]  = √ 57

 

So.....

 

sin θ  = y / r  =   √ 57 / 11

 

 

cool cool cool

CPhill  Jan 13, 2018

30 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.