Sin78°-sin18°+sin30°-sin42°. Value of this trigonometry from chapter 5
Isha , 9 Years ago
Grade 11
Trigonometry> Sin78°-sin18°+sin30°-sin42°. Value of thi...
1 Answersgaurav
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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