Answer:
the cost will be Rs 350
Step-by-step explanation:
The Scateboard cost Rs 450 each in the local store,The shop keeper says if I buy 1 I can buy another for only of the normal price. We are asked to determine the cost of a second scateboard .
Hence the cost will be of the normal cost that is
the cost will be Rs 350
Given :
Now, Substituing the value of y in equation (ii) :
Now, substituting the value of x in equation (i) :
Answer: sin = ±
Step-by-step explanation:
We very well know that,
cos2A=1−2sin²A
⟹ sinA = ±
As required, set A = & cos a=
,thus we get
sin =±
∴ sin =±
= ±
since ,360° < <450°
,180° < <225°
Now, we are to select the value with the correct sign. It's is obvious from the above constraints that the angle a/2 lies in the III-quadrant where 'sine' has negative value, thus the required value is negative.
hope it helped!