s5hannbro0nsa s5hannbro0nsa

21-11-2016
Mathematics

contestada

If A is an obtuse angle in a triangle and sin A is 5/13, calculate the exact value of sin 2A

Respuesta :

HomertheGenius HomertheGenius

24-11-2016

cos A = √( 1 - (5/13)²) = √( 1 - 25/169) = √(144/169) = - 12 /13 ( it is negative because A is an obtuse angle ).
sin 2 A = 2 sin A cos A
sin 2 A = 2 · 5/13 · ( - 12/13 ) = - 120 / 169

Answer Link

Otras preguntas

how to do this question plz answer me step by step plzz

Remove all perfect squares from inside the square root. Assume bbb is positive. \sqrt{80b^2}= 80b 2

.¿Cuál de las siguientes alternativas no corresponde a una transformación isométrica? A)Traslación B) Simetría C) Rotación D) Isometría C) Teselación

Recently an advertising company called 200 people and asked them to identify the company that was in an ad running nationwide. The following results were obtain

What are advantages & disadvantages of rivers

is a non active lifestyle that increases your risk for heart disease and numerous other health problems. wellness Proactive Sedentary Healthy

what figurative language is used in the below example his blue shirt blows in the breeze like a tattered kite

In companies that do not have "no lay-off" policies, the total direct labor cost for a budget period is computed by multiplying the total direct labor hours nee

definition of letter in communication skills

Amanda Roberts works a Monday through Friday work week at a rate of $8.75 per hour. She takes a 1- hour lunch break. If she clocks in each day at 8:45 am and le