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Grade: 10 
        Prove that 2cos? = 2^1/2 + 2^1/2 + 2cos 4? 

2^1/2 means root 2.
7 years ago

Answers : (1)

Vivek Nigam
28 Points 
							
wait i will have to try it......hmmm.....


ok..


apply inverse trignometry rules...that will surely get you towards the solution!
7 years ago
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