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Formulas are given right triangle, law of sin and law of cosine, heron's formula, parabolas, ellipses, arithmetic and geometric sequences.
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2 2 2 2 2 2
ta n (^) ta n ta n
1 ta n ta n
u v u v
u v
2 2
2
2 2
s in 2 2 s in c o s c o s 2 c o s s in
ta n 2 2 ta n 1 2 s in
1 ta n 2 c o s 1
1 c o s 1 c o s s in c o s 2 2 2 2
O p p o s ite A d ja c e n t O p p o s ite s in c o s ta n H y p o te n u s e H y p o te n u s e A d ja c e n t
s in A s in B s in C
a b c
2 2 2 c a b 2 a b c o s C
2 2 2 c o s 2
a b c C a b
K s (^) s a (^) s b (^) s c
2 2 y 4 p x o r x 4 p y
2 2 2 2
2 2 1;^ V e r tic a l^2
x y x y
a b b a
2 2 2 a b 0 , b a c
2 2
2 2 1
x y
a b
2 2
2 2 1
y x
a b
2 2 2 b c a
a 1 (^) , a (^) 2 , a 3 , a 1 (^) , a (^) 2 , a 3 ,
1 1
n a (^) n a r
1 2
n n
a a S n
n
n
a r S r r
(^1) if 1 1
a s r r
n (^) n
r r n r
0
n n (^) n r r
r
n x y x y r