# Trigonometry Question Help

Watch
Announcements
#1
Hi there,
I was just wondering if anyone could help me with this question:

Without using a calculator, evaluate the expression, simplifying it as far as possible:
1-sin^2(pi/6)

Thank you
0
1 month ago
#2
Not sure if this is some h/w question, so I will give you a hint, instead of a full solution:

There are certain angles for which we can calculate exact values of their sine, cosine, etc...
pi/6 is one of those angles. If you don't remember the exact value of sin(pi/6), try referring to your textbook/notes, it should be there.
After that the question is just arithmetic.

Hope this helped.

EDIT: You could also use a well-known trig identity to simplify the expression a bit, although it's not really necessary.
Last edited by The Malevolent; 1 month ago
0
#3
Hi, thank you for your response.
It was just a workbook question that i came across after a while.
Thank you that makes sense, i was just confused on like do i have to use any trig identities but now i understand it.

(Original post by The Malevolent)
Not sure if this is some h/w question, so I will give you a hint, instead of a full solution:

There are certain angles for which we can calculate exact values of their sine, cosine, etc...
pi/6 is one of those angles. If you don't remember the exact value of sin(pi/6), try referring to your textbook/notes, it should be there.
After that the question is just arithmetic.

Hope this helped.

EDIT: You could also use a well-known trig identity to simplify the expression a bit, although it's not really necessary.
0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### Poll

Join the discussion

#### Feeling behind at school/college? What is the best thing your teachers could to help you catch up?

Extra compulsory independent learning activities (eg, homework tasks) (14)
6.64%
Run extra compulsory lessons or workshops (34)
16.11%
Focus on making the normal lesson time with them as high quality as possible (34)
16.11%
Focus on making the normal learning resources as high quality/accessible as possible (31)
14.69%
Provide extra optional activities, lessons and/or workshops (57)
27.01%
Assess students, decide who needs extra support and focus on these students (41)
19.43%