The double angle formulae aren't on the data sheet, but the angle addition and subtraction formulae are, which can be used to derive them, so it's up to you if you want to memorise them.
sin2x + cos2x = 1, 1 + cot2x = cosec2x and tan2x + 1 = sec2x aren't on the data sheet, and are commonly needed.
The only other trig formulae that aren't given on the data sheet are for the reciprocal trig functions, and the identity tanx = sinx / cosx.
sin2x + cos2x = 1, 1 + cot2x = cosec2x and tan2x + 1 = sec2x aren't on the data sheet, and are commonly needed.
The only other trig formulae that aren't given on the data sheet are for the reciprocal trig functions, and the identity tanx = sinx / cosx.
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