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Verified answer
Materi : TrigonometrisinA = 3/5 dan A sudut lancip, maka
5² - 3²
= 25 - 9
= 16
= 4²
cosA = 4/5
cos2A
= cos²A - sin²A
= (4/5)² - (3/5)²
= 16/25 - 9/25
= 7/25
sin2A
= 2 sinA cosA
= 2 (3/5) (4/5)
= 24/25
tan2A
= sin2A / cos2A
= 24/7
a. sin 2a
= 2. sin a. cos a
= 2(3/5)(4/5)
= 24/25
b. cos 2a
= cos^2a-sin^2a
=(4/5)^2-(3/5)^2
= 16/25-9/25
= 7/25
C. tan 2a
= sin 2a/cos2a
= 24/7
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