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sin A = -7/25
tan A = 7/24
a. sin ¹/₂ =
cos A = 1 - 2 sin² ¹/₂ A
sin² ¹/₂ A = √(¹/₂(1 - cos A) = √(¹/₂ (1- (-²⁴/₂₅))=√(⁴⁹/₅₀)
sin ¹/₂ A = 7/(5√2) = (7/10)√2
b, tan 2A = 2 tan A / ( 1 - tan² A)
Tan 2A = 2(7/24) / ( 1 - (7/24)²)
tan 2A = (7/48) / (527/576) = 84/576
c. cos ¹/₂ A = √( cos A +1) = √(1/25) = 1/5
d. cos 2A = 2 cos² A - 1 = 2( -24/25)² - 1 527/625