yudw6Kanwester yudw6Kanwester

02-09-2016
Mathematics

contestada

Let cos x =1√10 with x in QIV and find: cot2x

Respuesta :

HomertheGenius HomertheGenius

11-09-2016

cos x = 1/√10
sin x = √( 1 - 1 /10 ) = √9/10 = - 3/√10 ( because x is in Q IV )
cot 2 x = cos 2 x/sin 2x = ( cos²x - sin²x)/ (2 sinx cosx ) =
= ( 1/10 - 3/10 )/(2 * (-3/√10)*1/√10)= (- 8/10 ) / (-6/10 ) = 8/6 = 4/3

Answer Link

Otras preguntas

Determine a polynomial function whose graph passes through the given points. 5: (0,-5); (1,-4) ; (-1,-9); (2,-3),

Which of the following functions f : {0, 1, 2, 3} ! {0, 1, . . . , 7} are one-to-one? 1) f(x) = x2 mod 8 2) f(x) = x3 mod 8 3)f(x)=(x^3-8) mod 8 4)f(x)=(x^3+2x)

Come up with two examples of ratio relationships that are interesting to you.

What is 9999*0 then + 27

from $16 to $4 decreased

What theme of Richard Connell’s story “The Most Dangerous Game” comes through in this excerpt?

what types of routes did the black death travel on

What are the behavior traits for Health

Under which conditions (in terms of kinetic energy) does boiling occur? How is the kinetic energy in the liquid increased?

Xavier can swim at a constant speed of 5/3 meters/second. a. What is the ratio of the number of meters to the number of seconds? b. Xavier is trying to qualify