tan(–405°) এর মান হ'ল: A. 1 B. –1 C. ∞ D. 0

tan is an odd function, so tan(−405°) = −tan 405°. Since tan repeats every 180°, tan 405° = tan(405° − 360°) = tan 45° = 1. So tan(−405°) = −1.