Question

1. If tanx=−2.5 then tan(−x) =

2. If sinx=0.1 then sin(−x) =

3. If cosx=0.8 then cos(−x)=

4. If tanx=−0.5 then tan(pi+x)=

Answer 1

or @hartnn

Answer 2

whoever gets here first !!!

Answer 3

\(\tan(-x)=-\tan x \\ \sin(-x)=-\sin x \\ \cos(-x)=\cos x\)

Answer 4

why is cos +?

Answer 5

because cos is even function, and for even functions, \(f(-x)=f(x)\)

Answer 6

sin and tan are odd functions, where, \(f(-x)=-f(x)\)

Answer 7

:O ahh yes i see... yes yes.

Answer 8

continue wise one.

Answer 9

\(\tan (x \pm n* \pi)=\tan x \\ so, \tan(x+\pi)= \tan x\)

Answer 10

where the hell did that n come from? O_o

Answer 11

that means for any value of n=1,2,3,4,....
i've first given generalized form, then have put n=1

Answer 12

ahhh gotcha... you almost lost me for a sec.

Answer 13

so you got all 4 now ?

Answer 14

well, no because i am trying not to use my calculator.
and honestly its a huge crutch for me in math so i seem
rather lost without it... and so no.. no i dont
plus i am kinda slow -_- and still dont know what to do.

Answer 15

tanx=−2.5
tan (-x) = - tan x = - (-2.5) =... ?

Answer 16

just 2.5?

Answer 17

thats correct :) was it difficult ?
try 2nd....

Answer 18

:O ahhhhh soooo -.1, .8, ... hmm... pi-.5

Answer 19

pi-.5 is incorrect... so .5 is 1/2... huh.. yeah idk what to do with that.

Answer 20

tan (pi+x) = tan x = -0.5

Answer 21

what happened to the pi?

Answer 22

nevermind. it clicked ! thanks !

Answer 23

welcome ^_^

Answer 24

i will be back for you ! brb!!!