The range of values k for which the equation `2 cos ^(4)x-sin ^(4)x +k=0` has atieast one solution is `[lamda, mu ].` Find the value of `(9mu+delta).`

The range of value's of k for which the equation 2 cos^(4) x - sin^(4) x + k = 0 has atleast one solution is [ lambda, mu] . Find the value of ( 9 mu + lambda) .

The range of value's of k for which the equation 2 cos^(4) x - sin^(4) x + k = 0 has atleast one solution is [ lambda, mu] . Find the value of ( 9 mu + lambda) .

The range of value's of k for which the equation 2 cos^(4) x - sin^(4) x + k = 0 has atleast one solution is [ lambda, mu] . Find the value of ( 9 mu + lambda) .

The number of integral values of k for which the equation 7 cos x + 5 sin x=2 k +1 has a solution is -

Find the no.of integral values of k for which the equation 7cos x+5sin x=2k+1 has atleast one solution.

The number of integral values of k for which the equation 7 cos x +5 sin x=2 k+1 has a solution, is

Find the number of integral values of k for which the equation 7 cos x+5 sin x=2k+1 has at least one solution.

Find the number of integral values of k for which the equation 7 cos x+5 sin x=2k+1 has at least one solution.

Find the number of integral values of k for which the equation 7 cos x+5 sin x=2k+1 has at least one solution.