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6. T-Ratios of Some Particular Angles
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Q26 of 27 Page 301

If 3x = cosec θ and 3/x = cot θ, find the value of

Given: 3x = cosec θ , and 3/x = cot θ


Consider



=


=


= 1/3 (∵ cosec2 x – cot2 x = 1)


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23

If sin (A + B) =1 and cos (A - B) = 1, 0° ≤ (A + B) ≤ 90° and A > B then find A and B.

24

If sin (A - B) = 1/2 and cos (A +B) = 1/2 ,0° < (A + B) < 90° and A > B then find A and B.

25

If tan (A - B) = 1/√3 and tan (A + B) = √3, 0° < (A + B) < 90° and A > B then find A and B.

27

If sin (A + B) = sin A cos B + cos A sin B , and

cos (A - B) = cos A cos B + sin A sin B, find the values of


(i) sin 75° and (ii) cos 15°.

Questions · 27
6. T-Ratios of Some Particular Angles
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