UP TGT Mathematics Trigonometry Test Series - Part 3
The value of cos^2(A) + cos^2(A + 120 degrees) + cos^2(A - 120 degrees) is always equal to:
Type: MCQ • Marks: 1
The value of cos^2(A) + cos^2(A + 120 degrees) + cos^2(A - 120 degrees) is always equal to:
Options
A. 0
B. 3
C. 3 / 2
D. 1
Explanation
(3 / 2). Compound angle formulas for sin(A+B), cos(A+B), and tan(A+B) govern sum and difference identities along with conditional triangle angle properties (A+B+C = pi).
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