jee-advanced 2017 Q52

jee-advanced · India · paper2 Addition & Double Angle Formulae Function Analysis via Identity Transformation

If the triangle $P Q R$ varies, then the minimum value of
$$\cos ( P + Q ) + \cos ( Q + R ) + \cos ( R + P )$$
is
[A] $- \frac { 5 } { 3 }$
[B] $- \frac { 3 } { 2 }$
[C] $\frac { 3 } { 2 }$
[D] $\frac { 5 } { 3 }$

If the triangle $P Q R$ varies, then the minimum value of

$$\cos ( P + Q ) + \cos ( Q + R ) + \cos ( R + P )$$

is

[A] $- \frac { 5 } { 3 }$

[B] $- \frac { 3 } { 2 }$

[C] $\frac { 3 } { 2 }$

[D] $\frac { 5 } { 3 }$

Paper Questions

Q37 Q38 Q39 Q40 Q41 Q42 Q43 Q44 Q45 Q46 Q47 Q48 Q49 Q50 Q51 Q52 Q53 Q54