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Find the extreme values of 3sin^2x + 5cos^2x.....................................................................................................

Find the extreme values of 3sin^2x + 5cos^2x.....................................................................................................

Grade:11

1 Answers

Vikas TU
14149 Points
4 years ago
Dear student 
We know that 
Sin^2x + Cos^2x = 1 
Cos^2x = 1-Sin^2x 
Put that in the equation 
3Sin^2x + 5 (1-Sin^2x ) + ….
5 – 2Sin^2x + 7 – 7 Sin^2x + 9 – 9 Sin^2x ….
It will form two AP. Find the sum of two AP.
Hope this helps 
Good luck 
Cheers 

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