Question

value of tan(-945)degree

Answer 1

tan(-945)=tan(-945+720)=tan(-225)

Answer 2

u cant write tan (-945)
as
-tan(945)
then u can write \[945 = 5\pi + \frac{ \pi }{ 4 }\]
remember
\[\pi = 180^{o}\]
so...
\[\tan(-945) = -\tan 945 = -\tan ( 5\pi + \frac{ \pi }{ 4 } ) = \tan [( 2\times 2\pi) + \pi + \frac{ \pi }{ 4 }]\]
\[= - \tan ( \pi + \frac{ \pi }{ 4 } )\]
\[= - \tan \frac{ \pi }{ 4 } = - \tan 45^{o} = -1\]

Answer 3

got it :) ?

Answer 4

=tan(-270+45)=-tan(45)=-1

Answer 5

thanks sir

Answer 6

i got it

Answer 7

u r welcome!

Answer 8

welcome

Answer 9

cos1degree.cos2degree.cos3degree...........cos179degree =??

Answer 10

sir plz give me ans.

Answer 11

it is <1

Answer 12

\[
\tan( k \pi + x)= \tan(x), k=0,\pm 1\pm 2,\pm3 \cdots \\
\tan(-x)=-\tan(x)\\
\tan\left(- \left(\frac { \pi}4+5\pi
\right)

\right) =-
\tan\left( \frac { \pi}4+5\pi


\right) =- \tan\left( \frac { \pi}4

\right) =-1

\]