Question

solve

Answer 1

\[\cos ^{2}\theta - \sin \theta = \frac{ 1 }{ 4 }\]

Answer 2

\[\left( 0 \le \theta \le 360\right)\]

Answer 3

write cos^2 = 1- sin^2
then you will get a quadratic in sin

Answer 4

ok @hartnn i got it...but why the -ve value is not used to find the angles?

Answer 5

negative value is used!

the value which is less than -1 or greater than 1 is NOT used

Answer 6

because the range of sin function is -1 to 1
so, sin theta can never be -3/2

Answer 7

makes sense ?

Answer 8

if you would have got -1/2, then you should use it

Answer 9

thank you very much! :)

Answer 10

welcome ^_^