Question

sin 78° - sin 18° + sin 30°- sin 42° what is the ans of this equation​

Answer 1

Answer:

sin78-sin18+sin30-sin42=sin78-sin42-sin18+sin30=2cos(120/2).sin18-sin18+sin30=2cos60.sin18-sin18+sin30=(2×1/2).sin18-sin18+sin30=sin18-sin18+1/2=1/2

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Answer 2

Answer:

sin 78°-sin 18°+sin 30°-sin 42°=1/2

We used the formula. : sin(A-B)=2 cos (A+B/2).sin (A-B/2)