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9. Trigonometry
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Q2 of 104 Page 196

Prove the following:

cos(90–θ ) = sinθ

tan(90–θ ) = cotθ


sin(90–θ ) = cosθ


cot(90–θ ) = tanθ


cosec(90–θ ) = secθ


sec(90–θ) = cosecθ


L.H.S





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2

Prove the following:

— 2cos70 cosec20 = 0

2

Prove the following:

3

Express the following in terms of trigonometric ratios of angles having measure between 0 and 45:

(1) sin85 + cosec85


(2) cos89 + cosec87


(3) sec81 + cosec54

4

For ΔABC, prove that (1) ,

(2)

Questions · 104
9. Trigonometry
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 1 1 1 1 2 2 2 2 3 4 5 6 7 7 8 9 1 1 1 1 1 1 1 1 1 1 2 2 2 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 24 25 26 27 28 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29
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