Home
Class 11
MATHS
sin25^@cos115^@=1/2(sin40^@-1)...

`sin25^@cos115^@=1/2(sin40^@-1)`

Text Solution

Verified by Experts

LHS
`sin25*cos115`
`sin25(-sin25)`
`-sin^2 25`
`-(1-cos50)/2`
`1/2(cos50-1)`
`1/2(sin40-1)`
RHS.
Promotional Banner

Similar Questions

Explore conceptually related problems

Prove tha sin25^(0)cos115^(0)=(1)/(2)(sin40^(@)-1)

Prove tha sin 25^0 cos 115^0 = 1/2 (sin 140^0 -1)

(sqrt2-sin25^(@)-cos25^(@))/(sin25^(@)-cos25^(@)) is equal to

cos70^(@)+sin40^(@)=

cos70^(@)+sin40^(@)=

Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1

Prove that: (cos40^(@)+cos50^(@))/(sin40^(@)+sin50^(@))=1

Evaluate :- sin25^@cos65^@+cos25^@sin65^@ .

If tantheta=(cos25^(@)+sin25^(@))/(cos25^(@)-sin25^(@))andtheta is in the third quadrant, then theta =

If tantheta=(cos25^(@)+sin25^(@))/(cos25^(@)-sin25^(@))andtheta is in the third quadrant, then theta =