SN Dey Class 11 Solutions Compound Angles Very Short Answer Type Questions

SN Dey Class 11 Chapter  Solutions. Compound Angles VSATQ. Solutions of Trigonometric Ratios of Compound Angles Very Short Answer Type Questions

Ex 1(i):  Find the Value of

sin(-75°)

Solution:

sn dey class 11 compound angles very short q1.(i) solution

 

Ex 1(ii):  Find the Value of

cos15°

Solution:

sn dey class 11 compound angles very short q1.(ii) solution.png

 

Ex 1(iii):  Find the Value of

tan(-105°)

Solution:

sn dey class 11 compound angles very short q1.(iii) solution.png

 

Ex 1(iv):  Find the Value of

sec(-75°)

Solution:

sn dey class 11 compound angles very short q1.(iv) solution.png

 

Ex 2(i):  Prove that tan75° – cot75° = 4 sin60°

Solution:

sn dey class 11 compound angles very short q2.(i) solution

 

Ex 2(ii):  Prove that cosα + cos(120°+α) + cos(120°-α) = 0

Solution:

sn dey class 11 compound angles very short q2.(ii) solution

 

Ex 2(iii):  Prove that tan35° + tan10° + tan35° tan10° = 1

Solution:

sn dey class 11 compound angles very short q2.(iii) solution

 

Ex 2(iv):  Prove that tan8α – tan5α – tan3α = tan8α tan5α tan3α

Solution:

sn dey class 11 compound angles very short q2.(iv) solution

 

Ex 2(v):  Prove that tan43° = $\dfrac{\cos 2^\circ-\sin 2^\circ}{\cos 2^\circ+\sin 2^\circ}$

Solution:

sn dey class 11 compound angles very short q2.(v) solution

 

Ex 2(vi):  Prove that tan62° = 2 tan34° + tan28°

Solution:

sn dey class 11 compound angles very short q2.(vi) solution