Question

cos theta = 5/13 then cos 2 theta =​

Answer 1

Answer:

GIVEN : Cos A = 5/13

Since, Cos A = base / hypotenuse

By Pythagoras Theoerem

h²=p²+b²

=> 13² = p² + 5²

=> 169 = p² + 25

=> 169-25 = p²

=> 144 = p²

= > $\sf {\sqrt{144 = p}}$

=> 12 = p

Therefore

p= 12 , b = 5 , h = 13

Cos A = 5/13

Tan A = p/b

= 12/5

cot A = b/p

= 5/12

sec A = h/b

= 13/5

cosec A = h/p

= 13/12