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By formula
Cos 2A = Cos²ASin²A
Cos²ASin²A=Cos²A(1Cos²A) =Cos²A 1 +Cos²A=2 Cos²A  1
so, Cos 2A = 2 Cos²A  1
3sinA4sin^{3}A=sin^{3}A
Given, 3 sin 10°  4 sin 3 10°
So, sin^{3}A i.e sin 30
= ½
In a triangle ABC, if angle A = 72°, angle B = 48° and c = 9 cm then the Ĉ is
In any traingle The sum of 3 sides of a traingle is equal to 180°
Given
A=72°
B=48°
A+B+C=180°
72°+48°+C=180°
C=180°120°
C=60°
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