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Sin78°-sin18°+sin30°-sin42° , find the value about this trigonometry chapter 5

Sin78°-sin18°+sin30°-sin42° , find the value about this trigonometry chapter 5

Grade:11

1 Answers

Jack reacher
19 Points
4 years ago
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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