natash8dan natash8dan
  • 03-03-2018
  • Mathematics
contestada

if a and b are acute angles such that sinA=4/5 and cosB=12/13, calculate, without using tables: sin(a-b)

Respuesta :

Banabanana
Banabanana Banabanana
  • 03-03-2018
[tex]\sin \alpha = \frac{4}{5} \\ \cos \alpha = \sqrt{1-\sin^2 \alpha }= \sqrt{1- \frac{16}{25} } = \sqrt{ \frac{9}{25} }= \frac{3}{5} \\ \\ \cos \beta = \frac{12}{13} \\ \sin \beta = \sqrt{1-\cos^2 \beta }= \sqrt{1- \frac{144}{169} } = \sqrt{ \frac{25}{169} }= \frac{5}{13} [/tex]


[tex] \\ \\ \sin (\alpha- \beta ) =\sin \alpha \cos \beta -\cos \alpha \sin \beta = \frac{4}{5}\times \frac{12}{13}- \frac{3}{5}\times \frac{5}{13} = \frac{48}{65}- \frac{15}{65}= \frac{33}{65} [/tex]

Answer:
sin(α-β) = 33/65
Answer Link

Otras preguntas

How did the last ice age affect paleolithic people? whap?
According to your study unit, which one of the following improved human relations skills will allow you to more willingly take on challenging subjects?        A
Two sides of a triangle have lengths 8 ft and 12 ft. describe the possible lengths of the third side.
#Algebra2 -someoneplshelp
What is the value of t in the equation t+5=-25
Susan is traveling from Queens to Staten Island via Manhattan. There are 3 different trains that travel from her home in Queens to Times Square, 5 trains that r
if g(x) = k•f(x) what is the value of k
Read the excerpt below to answer the question. In front of us, those flames. In the air, the smell of burning flesh. It must have been around midnight. We had
(12n - n) + 5n How do you solve this 4th grade math question?
What are 4 equivalent expressions for 15x + 25x?