What is the exact value of cos(¹1)? 。 01 一点 (-1,0) (六) 或 T 180° (二) 6 240 135° 150° 120° 6. 2017 (一) (六) y (0, 1) Fla 90° 270° Bm 2 | 3 4 4/6 60° 45° 30% 300。 315° 330° 00、 (0, -1) (1/1, -1/³) NI (六) (六) 11 () 0 (1,0) " ()

Two derivations of the identity sec¬1(-x) = # – sec-lx a. (Geometric) Here is a pictorial proof that sec-'(-x) = T - sec-lx. See if you can tell what is going on. y = sec-lx х b. (Algebraic) Derive the identity sec¬'(-x) = T – sec-lx by combining the following two equations from the text: cos(-x) = T – cosx Eq. (4), Section 1.6 sec-lx = cos'(1/x) Eq. (1)

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If cos (x + 7) + sin(x the number A π F) 3 = A, then