HOW TO PROOF THIS QUESTION Q. COS C = -COS(A+B).PLEASE TELL ME
Manikant Thakur , 6 Years ago
Grade 12th pass
Trigonometry> HOW TO PROOF THIS QUESTION Q. COS C = -CO...
1 Answers
Arun
Last Activity: 6 Years ago
Dear student
As we know
in a triangle
A+ B + C = 180
Now
A+B = 180 – C
take cos both sides
cos (A+ B) = cos (180 – C)
cos A+B = – cos C
cos C = – cos (A+B)
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