हिंदी

If tan 2A = cot (A – 18°), where 2A is an acute angle, find the value of A.

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प्रश्न

If tan 2A = cot (A – 18°), where 2A is an acute angle, find the value of A.

योग
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उत्तर

tan 2A = cot (A – 18°)

cot (90° – 2A) = cot (A – 18°)

(∵ cot (90° – θ) = tan θ)

90° – 2A = A – 18°

3A = 108°

A = 36°

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अध्याय 10: Trigonometric Ratios - EXERCISE 10.3 [पृष्ठ १०.३७]

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आर.डी. शर्मा Mathematics [English] Class 10
अध्याय 10 Trigonometric Ratios
EXERCISE 10.3 | Q 14. | पृष्ठ १०.३७
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