Math, asked by SuratSat, 1 year ago

pls evaluate cos 9pi/4

Answers

Answered by udaysaikiran2001

cos(2π+π/4)
cos(π/4) =1/√2

udaysaikiran2001: 0.25

SuratSat: is there another way to solve it

udaysaikiran2001: u mean answer should be lengthy

SuratSat: no

udaysaikiran2001: ok i will try another process

SuratSat: we haven't studied the formula that cospi/4is 1/root2

SuratSat: thanx

udaysaikiran2001: cos 9π/4. = subtract 2π from 9π , A= 9π/4-2 then we get A = π/4 for value definition of cosine cos π/4 = √2/2/1 multiple numerator by reciprocal √2/2.1 hence 0.707106.

SuratSat: thanku so much

udaysaikiran2001: my pleasure

Answered by hello1939

$cos \: 9\pi \div 4$
cos(9×22)/(7×4)
=cos99/14
=cos 7.08
=0.9923934503
=approx. answer is 1

SuratSat: sorry but this is not the ans

hello1939: k sorry

Previous Question

Next Question