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Mustaqeem Ahmad Grade: 11
        sin25°cos115°=1/2(sin40°-1)
one year ago

Answers : (3)

noogler
490 Points
										
apply the formula 2cosAsinB=sin(A+B)-sin(A-B)
1/2(2cos115osin25o)=1/2(sin240o-sin90o)                              
 
plz check ur questin again.i think it should be  sin25°cos115°=1/2(sin240°-1)
 
approve if it is r8
one year ago
Lab Bhattacharjee
120 Points
										
2sin25°cos115°=sin140°-sin90°=sin(180°-40°)-1
Use sin(180°-y)=sin y



 
one year ago
noogler
490 Points
										
sorry for the wrong ans
 
apply the formula 2cosAsinB=sin(A+B)-sin(A-B)
1/2(2cos115osin25o)=1/2(sin140o-sin90o)
=1/2(sin(180-40)-1)=1/2(sin40o-1)                             
 
 
approve if it is r8
one year ago
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