Unit 7 lesson 2 investigation 2
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Unit 7 Lesson 2 Investigation 2. Proving Trigonometric Identities. Page 465 from the C+4B Text. Reciprocal Identities Quotient Identities Pythagorean Identities. Let’s start off with an easy example:. We will make the left side look like the right first by using the Pythagorean identity.

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Unit 7 lesson 2 investigation 2

Unit 7 Lesson 2 Investigation 2

Proving Trigonometric Identities


Page 465 from the c 4b text
Page 465 from the C+4B Text

Reciprocal IdentitiesQuotient IdentitiesPythagorean Identities


Let s start off with an easy example
Let’s start off with an easy example:

We will make the left side look like the right first by using the Pythagorean identity

Next, we will re-write tan using the quotient identity


From the last slide:

We will finish by reducing cosine and both sides will now be identical.



We will start by working on the

left side of the equation by rewriting the sine and cosine using the quotient identity:


Now we can cross cancel inside the parenthesis

Inside the brackets we need a common denominator


Next, we combine the fraction

Again we can cross cancel sinx

and we are left with…

Which equals the right side!


Here is another example:

Let’s start by working on the right side of the equation by multiplying by 1

in the conjugate of the denominator.


Multiply the denominator (hint: use foil)

Use the Pythagorean indentify to simplify the denominator


Distribute the numerator:

Separate the fraction:

Reduce the fractions:


Next, simplify each fraction

The identity is now complete and so is the tutorial. See your teacher for practice problems.


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