Formulas To transform product into sum or difference
Chapter Trigonometry class 11
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your answer is here !
Step-by-step explanation:
the six circular functions may be defined as under
(i) cos θ = x
(ii) sin θ = y
(iii) sec θ = 1/x, x ≠ 0
(iv) cosec θ = 1/y, y ≠ 0
(v) tan θ = y/x, x ≠ 0
(vi) cot θ = x/y, y ≠ 0
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