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rosijanka [135]
3 years ago
14

How to find cos2theta

Mathematics
2 answers:
horrorfan [7]3 years ago
8 0
These are the double angle formulas. What the other person mentioned above is the sum and difference formula.

SSSSS [86.1K]3 years ago
5 0
You can use the sum and difference identities which for cosine is cos(a+b)= cosacosb-sinasinb
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The values of angles are 140 and 20

• In plane geometry, a figure which is formed by joining of two lines that share a common point is called as the angle. The two lines or rays are called as the sides of the angle and the common point is called the vertex.

• In geometry there are types of angles such as complementary angles, supplementary angles, acute angle, obtuse angles. Complementary angles are the angles whose sum is equal to 90. Supplementary angles are the angles whose sum is equal to 180.

According to the question

We are given that one angle is -7x and the other angle is -2x

Using formula of supplementary angles

-7x + (-2x) = 180

-7x -2x = 180

-9x = 180

-x = 20

x = -20

The value of x is -20

The value of angle – 7x = -7(-20) = 140

The value of angle -2x = -2(-20) = 40

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brainly.com/question/25716982

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