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यदि cos20^(@)=m और 70^(@)=n है तो m^(2)...

यदि `cos20^(@)=m` और `70^(@)=n` है तो `m^(2)+n^(2)` का मान बताएं

A

`(1)/(2)`

B

`1`

C

`(3)/(2)`

D

`(1)/(sqrt(2))`

लिखित उत्तर

Verified by Experts

The correct Answer is:
b
`cos20^(@)=m`
`cos70^(@)=n`
So, `m^(2)+ n^(2)+cos^(2)20^(@)+cos^(2)70^(@)`
` [cos^(2)A+cos^(2)B=1 "If" A+B=90^(@)]`
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