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Objective: Use pythagorean identities.
Warm Up Fill in the blanks. a. If , then __________and ________. b. If , then =_________and =______. c. If and , then __________.
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2. Find a positive and a negative coterminal angles of 60 degrees. Find sine, cosine and tangent of the three angles. c. Based on your observations. What is your conjecture?
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Pythagorean Identities
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Example 1 Given that and . Find the value of using a trig identity.
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Example 2 If ; . Find and .
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Example 3 Find and . If .
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Example 4 Find the value using identities. a. b.
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Example 5 Find (Use calculator). cos 0.3 sec 0.3 c. d.
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Assignment: Pg 487 #29-38; 61-70
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HW CHECK Pg. 498 #5 Pg. 486# 7, 8, 10 Pg #20,24 Collecting: Review Sheet 4.1
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