In trig ratios proving problems we will learn how to proof the questions step-by-step using trigonometric identities.
1. If (1 + cos A)( 1 + cos B)( 1 + cos C) = (1 - cos A)( 1 -
cos B)( 1 - cos C) then prove that each side = ± sin A sin B sin C.
Solution: Let, (1 + cos A) (1 + cos B) (1 + cos C) = k …. (i)
Therefore, according to the problem,
(1 - cos A) (1 - cos B) (1 - cos C) = k ….. (ii)
Now multiplying both sides of (i) and (ii) we get,
(1 + cos A)(1 + cos B)(1 + cos C)(1 - cos A)(1 - cos B)(1 - cos C) = k2 k = ± sin A sin B sin C.
Therefore, each side of the given condition
= k = ± sin A sin B sin C
Proved.
More solved examples on trig ratios proving problems.
Proved.
Proved.
The above three trig ratios proving problems will help us to solve more basic problems on T-ratio.
Relations Between the Trigonometric Ratios
Problems on Trigonometric Ratios
Reciprocal Relations of Trigonometric Ratios
Problems on Trigonometric Identities
Elimination of Trigonometric Ratios
Eliminate Theta between the equations
Verify Trigonometric Identities
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