Question

if the value of sin 10 + sin 20 + sin 40 + sin 50- sin 70 - sin 80 is k hen find the value of k

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

sin10+sin20+sin40+sin50-sin50-sin70-sin80= k

sin10+sin20+sin40+sin50-sin(90-20)-sin(90-10)=k

sin10+sin20+sin40+sin50-sin20-sin10

sin10,sin20 cancelled

sin40+sin50=sin90=k

k=1

Hope this helps you