Let r and `r^(')` denote the angles iniside an equilateral prism, as usual, in degrees. Consider that during some time interval from `t=0` to`t=t,r^(')` varies with time as `r^(')=10+t^(2)`. During this time, r will vary as (assume that r and `r^(')` are in degree)

Options

A. `50-t^(2)`
B. `50 + t^(2)`
C. `60 - t^(2)`
D. `60 + t^(2)`

Answer

A

Explanation

In a prism :`r + r' = A`
`rArr r = A = r'`
`:. R = 60^(@) -(10 + t_(2)) 50 - t_(2)`.