Question

what is the value of cos(tan^-1, 1)

Answer 1

@ganeshie8

Answer 2

find \(\tan^{-1}1\) first

Answer 3

we should memorize that value :-
tan(pi/4) = 1
so, tan^-1(1) = pi/4

Answer 4

so,

\(\cos(\tan^{-1}1) = \cos(\pi/4) = ?\)

Answer 5

is it 2?

Answer 6

@ganeshie8

Answer 7

cos value lies between -1 and +1
so 2 is not an answer

Answer 8

http://www.analyzemath.com/trigonometry/special_angles_1.gif

Answer 9

look at that table, and see if u can find the cos(pi/4) value :)

Answer 10

square root of 2?

Answer 11

@ganeshie8

Answer 12

hmm no. here it is :-
\(\large \cos(\pi/4) = \frac{\sqrt{2}}{2}\)

Answer 13

it helps in ur rest of course in trig, if u can memorize that table

Answer 14

just memorize the sin row, u can generate all other rows from sin