Question

Cos3*/cos*-sin*+sin3*/sin*-cos*=1+sin*cos*

Answer 1

Answer:

Step-by-step explanation:

os  

3

x−sin  

3

x

​

 

=  

cosx−sinx

(cosx−sinx)(cos  

2

x+sin  

2

x+sinxcosx)

​

 

=1+sinxcosx             (as cos  

2

x+sin  

2

x=1)

=  

2

1

​

(2+2sinxcosx)

=  

2

1

​

(2+sin2x)