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TRIGONOMETRIC FUNCTIONS 2 tan A tan 2A iii y tan x 1 tan 2 Aa Sign of trigonometric functions in the four 5. Zefrysasedumy 1 NOTES AND FORMULAE SPM MATHEMATICS FORM 1 3 NOTES 1. 2 4 2 b b ac x a 2. A point dividing a segment of a line 4.