Question

Find the general value of A, when cos(-A/2)=0​

Answer 1

Answer:

cos (-180)/2=0......

Answer 2

Answer:

180

Step-by-step explanation:

As we have given in the question that $cos[\dfrac{-a}{2}]=0$

We need to find the value of a for which the whole term would be =0

Therefore for solving this question, we must have a good knowledge of trigonometric values, As we know that cos is 0 at 90°

Therefore if we put the value of a=180°, We get the value 90° as $\dfrac{-180}{2}=-90$

As$cos[\dfrac{-180}{2}]=0$

So the final answer would be 180