Let a(t)=[3sin(t)3 sin(t)−4 cos(t)4 cos(t)]. find the values of t such that a(t) is not invertible. you may use k to denote any possible integer in your answer (e. g., if the answer is all integer multiples of 5, you would enter 5k, where k is any integer). a(t) is not invertible when t= k*pi/2 , where k is any integer. find a formula for a−1(t) for the values of t for which a(t) is invertible. a−1(t)= ⎡⎣⎢⎢⎢ ⎤⎦⎥⎥⎥