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Answer to Credit revision Q 1 a b c sinA sinb sinC == A B C a b c

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Answer to Credit revision Q 2 (i)common factor (ii)difference of two squares (iii)trinomial (put in brackets)

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Answer to Credit revision Q 4 (i) decide on the 2 quadrants (cos is -ve) (ii) ignore the sign and press INV cos to get angle (iii) work out your 2 angles

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Answer to Credit revision Q 3 tan x

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Answer to Credit revision Q 6 1

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Answer to Credit revision Q 5 m = y 2 – y 1 x 2 – x 1 A(x 1,y 1 ) B(x 2,y 2 ) x y

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Answer to Credit revision Q 8 a 2 = b 2 +c 2 -2bccosA A B C a b c

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Answer to Credit revision Q 7 For ΔABC, right-angled at A, a 2 = b 2 + c 2 A B C a c b

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Answer to Credit revision Q 10 cos A = b 2 + c 2 - a 2 2bc A B C a b c

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Answer to Credit revision Q 9 It means there is a root eg x = x 2 1 --

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Answer to Credit revision Q 12 x = 5 x = 3 x = 5 x = 0 x = 1

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Answer to Credit revision Q 11 x 2 y+y 2xy = x+ y x

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Section 1.4 Trigonometric Functions an ANY Angle Evaluate trig functions of any angle Use reference angles to evaluate trig functions.

Section 1.4 Trigonometric Functions an ANY Angle Evaluate trig functions of any angle Use reference angles to evaluate trig functions.

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