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प्रश्न
prove that:
cos (2 x 30°) = `(1 – tan^2 30°)/(1+tan^2 30°)`
योग
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उत्तर
RHS,
`(1 – tan^2 30°)/(1 +tan^2 30°) = (1–(1)/(3))/(1+(1)/(3)) = (1)/(2)`
LHS,
cos (2 x 30°) = `cos 60° = (1)/(2)`
LHS = RHS
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क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 21: Trigonometrical Ratios [Sine, Consine, Tangent of an Angle and their Reciprocals] - EXERCISE 21 (C) [पृष्ठ ३२२]
