Help
Contact
For teachers and institutes
Search courses, problems, tests…
A
A
>_
StemPy Lab
Courses ▾
Problems ▾
Practice ▾
Mock Tests
Classes
Groups
Community ▾
A
A
Which statement is true for every angle x? | StemPy Lab
Quizzes
/
Which statement is true for every angle x?
Mathematics
Easy
High School (11–12)
Trigonometry › Compound and Multiple Angles
Trigonometry › Trigonometric Identities
Created by
StemPy Lab
Which statement is true for every angle
x
x
x
?
1
+
cos
2
x
=
2
cos
2
x
1 + \cos 2x = 2\cos^2 x
1
+
cos
2
x
=
2
cos
2
x
1
+
cos
2
x
=
2
sin
2
x
1 + \cos 2x = 2\sin^2 x
1
+
cos
2
x
=
2
sin
2
x
cos
2
x
=
2
cos
x
\cos 2x = 2\cos x
cos
2
x
=
2
cos
x
1
−
cos
2
x
=
2
cos
2
x
1 - \cos 2x = 2\cos^2 x
1
−
cos
2
x
=
2
cos
2
x
Check Answer
Log in to save
Tag someone
⚑ Report
← All Quizzes
← An angle has sin x = 1/4. What is sin 3x?
Express sin 5x + sin x as a product. →
More on
Trigonometry › Compound and Multiple Angles
Trigonometry › Trigonometric Identities
Discussion (0)
Log in
to join the discussion.
Loading…
Show that cos 20° cos 40° cos 80° = 1/8, and write the product as a decimal.
Hard
Prove that (cos 9x - cos 5x)/(sin 17x - sin 3x) = -(sin 2x)/(cos 10x).
Medium
Write 2 cos 5x cos 3x as a sum of two cosines.
Easy
Prove that (1 - cos 2x + sin 2x)/(1 + cos 2x + sin 2x) = tan x.
Medium
All problems on this topic →