home
Menu
Create
Random
0
0
0
thumbnail

Trigometric Identities- x/2, 2x, a+b, a-b

Quiz by
ckyme
Rate:
Last updated: March 14, 2025
You have not attempted this quiz yet.
More quiz info >>
First submittedMarch 14, 2025
Times taken31
Average score50.0%
Report this quizReport
Quiz and answer stats >>
Friends stats >>
4:00
Enter answer here
0
 / 16 guessed
The quiz is paused. You have remaining.
Scoring
You scored / = %
This beats or equals % of test takers also scored 100%
The average score is
Your high score is
Your fastest time is
Keep scrolling down for answers and more stats ...
Hint
Answer
sin(a+b)
sinacosb+cosasinb
cos(a+b)
cosacosb-sinasinb
tan(a+b)
(tana+tanb)/(1-tanatanb)
sin(a-b)
sinacosb-cosasinb
cos(a-b)
cosacosb+sinasinb
tan(a-b)
(tana-tanb)/(1+tanatanb)
sin2x
2sinxcosx
cos2x
cosx^2+sinx^2
Hint
Answer
cos2x
2cosx^2-1
cos2x
1-2sinx^2
tan2x
(2tanx)/(1-tanx^2)
sin(x/2)
+-sqrt((1-cosx^2)/2)
cos(x/2)
+-sqrt((1+cosx^2)/2)
tan(x/2)
+-sqrt((1-cosx)/(1+cosx))
tan(x/2)
(1-cosx)/(sinx)
tan(x/2)
(sinx)/(1+cosx)
Save Your Stats
Your Next Quiz
Letters of the Greek Alphabet - Sudden Death
Can you click the letters of the ancient Greek alphabet without making any mistakes?
Pin US States on a Borderless Map - Sudden Death
Drag the flag onto the correct state. Careful, though! One wrong move and the game ends.
Pin Europe on a Borderless Map - Sudden Death
Drag the flag onto the correct country. Careful, though! One wrong move and the game ends.
Pin Africa on a Borderless Map
Drag the pin onto the correct country. Careful, though! Three wrong moves and the game ends.
1 Comments
goofynoodles
+1
Level 39
Mar 25, 2026
cos2x = cos^2(x)-sin^2(x)
Copyright H Brothers Inc, 2008–2026
Contact Us | Go To Top | View Mobile Site | Site Map