Graph the expressions on each side of the equals symbol to determine whether the equation might be an identity. (Note: Use a domain whose length is at least 2T.) If the equation looks like an identity, then verify it algebraically. See Example 1. sec 2 x 93. 2 + 5 cos x = 2 csc x + 5 cot x 94. 1 + cot2 x = sin x sec2 x - 1