3. If tanx=, what is cos2x, given that 0 < x <= ? a) c) b) d) - 07/00 7 25 4. Which expression is equivalent to cos135° cos30° a) - cos15° b) cos105° 7 25 8 5 sin135 sin30°? c) cos(105° + 30°) d) - cos105°

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