WBCHSE Mathematics for Class 11>Chapter 33 - Trigonometry>EXERCISE 1>Q 255

EASY

11th West Bengal Board

IMPORTANT

Earn 100

In a $∆ A B C, b c \cos^{2} \frac{A}{2} + c a \cos^{2} \frac{B}{2} + a b \cos^{2} \frac{C}{2} = ?$

50% studentsanswered this correctly

Important Questions on Trigonometry

EASY

11th West Bengal Board

IMPORTANT

WBCHSE Mathematics for Class 11>Chapter 33 - Trigonometry>EXERCISE 1>Q 256

In a

∆ A B C, 2 a b c \cos \frac{A}{2} \cos \frac{B}{2} \cos \frac{C}{2} = ?

EASY

11th West Bengal Board

IMPORTANT

WBCHSE Mathematics for Class 11>Chapter 33 - Trigonometry>EXERCISE 1>Q 257

In a

∆ A B C, if \cos \frac{A}{2} = \sqrt{\frac{b + c}{2 c}}

, then

EASY

11th West Bengal Board

IMPORTANT

WBCHSE Mathematics for Class 11>Chapter 33 - Trigonometry>EXERCISE 1>Q 258

In a

∆ A B C, if \cot \frac{A}{2} : \cot \frac{B}{2} : \cot \frac{C}{2} = 3 : 5 : 7, then a : b : c = ?

EASY

11th West Bengal Board

IMPORTANT

WBCHSE Mathematics for Class 11>Chapter 33 - Trigonometry>EXERCISE 1>Q 259

If

a = 16, b = 24

and

c = 20

, then

\cos \frac{B}{2} = ?

EASY

11th West Bengal Board

IMPORTANT

WBCHSE Mathematics for Class 11>Chapter 33 - Trigonometry>EXERCISE 1>Q 260

In a

∆ A B C

, if

a \cos A = b \cos B

, then

∆ A B C

is