Question

State whether the following are true or false. Justify your answer.

(i) The value of tan A is always less than 

(ii) sec A = \(\frac{12}{5}\) 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 = \(\frac{4}{3}\) for some angle θ.

Answer 1

(i) The value of tan 90° is greater than 1. Therefore, given statement is false. 

(ii)  sec A = \(\frac{12}5\) ⇒ cos A = \(\frac{5}{12}\) as 12 is the hypotenuse largest side. Therefore, given statement is true. 

(iii) cos A is the abbreviation used for cosine of angle A Therefore, given statement is true. 

(iv) cot A is not the product of cot and A. Therefore, given statement is false. 

(v) Since, the hypotenuse is the longest side whereas in sin A = \(\frac{4}{3}\), 3 which is the denominator and cannot be hypotenous.