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cos^(2)25^(@)+cos^(2)35^(@)-cos25^(@) co...

`cos^(2)25^(@)+cos^(2)35^(@)-cos25^(@) cos35^(@)=`

A

`1/4`

B

`3/4`

C

`5/4`

D

`1/2`

Text Solution

Verified by Experts

The correct Answer is:
B
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AAKASH SERIES-MULTIPLE & SUBMULTIPLE ANGLES-PRACTICE EXERCISE
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  2. (Sin^(3)43^(@)-Sin^(3)17^(@))/(Sin43^(@)-Sin17^(@))=

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  6. sin^(3)20^(@)+sin^(3)40^(@)-sin^(3)80^(@)=

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  11. IF tan^2 theta=2 tan^2 phi +1 then find the value of cos 2 theta+sin^2...

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  12. If x in (45^(@),90^(@)), sin2x=1/2, then sin^(3)x-3/4 sinx=

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  13. If (sin alpha )/(a) = ( cos alpha )/(b) , then a sin 2alpha + b cos 2...

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  16. The angle theta whose cosine is equal to its tangent is given by

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  17. If tan x=(b)/(a) " then " sqrt((a+b)/(a-b))+sqrt((a-b)/(a+b))=

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