2tano 9-10. Show that sin20 = 1+tan20 1-tan?a 11-12. Prove that cos2a sec2a
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.5: Product-to-sum And Sum-to-product Formulas
Problem 15E
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![2tano
9-10. Show that sin20 =
1+tan20
1-tan?
sec2 a
11-12. Prove that cos2a](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6c79f5db-561e-40ad-9272-69167f19b3f6%2F5f0ce599-3fd1-45b5-b0b2-d887cb1bd8b6%2F4kn8skp_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2tano
9-10. Show that sin20 =
1+tan20
1-tan?
sec2 a
11-12. Prove that cos2a
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