Question
State whether the following are true or false. Justify your answer.
(i) The value of tan A is always less than 1.
(ii) sec A = 12/5 for some value of angle A.
(iii) cos A is the abbreviation used for the cosecant of angle A.
(iv) cot A is the product of cot and A.
(v) sin θ= 4/3 for some angle 6.
Solution
(i) False, since and perpendicular may be longer than base.
(ii) True, since and hypotenuse being the longest side may be times the base.
(iii) False, since cos A is the abbreviation used for the cosine of angle A.
(iv) False, since cot A is used as an abbreviation for 'the cotangent of the angle A'.
(v) False, since the hypotenuse is the longest side in a right triangle. As such the value of sin A is always less than 1 (or, in particular equal to 1).