Question

Find lemda if sin 25° cos 115° =1/2(sin40°+lemda)​

Answer 1

Answer:

2sin25°cos115°=sin140°-sin90°=sin(180°-40°)-1

Use sin(180°-y)=sin yapply 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)

Step-by-step explanation:

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