Question

1/- 2 * (sin^- 2 x + cos^- 2 x) - 1/- 4 * (sin^- 4 x + cos^- 4 x) ​

Answer 1

Step-by-step explanation:

till this I was able to simplify

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Answer 2

Answer:

RHS=2(cos4  x+sin4  x)

=2((cos  

2

x)  

2

+(sin  

2

x)  

2

)

=2((cos  

2

x+sin  

2

x)−2sin  

2

xcos  

2

x)

=2−4sin  

2

xcos  

2

x

=2−4.  

2

1−cos2x

​

×  

2

1+cos2x

​

 

=2−(1−cos  

2

2x)=1+cos  

2

2x

Hence Proved.