Find sin theta and tan theta if cos theta=-12/13 and theta lies in 3rd quadrant
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Step-by-step explanation:
Given:- cos theta = -(12/13)= आधार/कर्ण---(1)
3rd quadrant में tan positive जबकि sin व cos negative होते हैं।
अर्थात् चूँकि tan theta का मान धनात्मक होगा इसलिए लम्ब व आधार भी धनात्मक होंगे।
समीकरण (1) से -
आधार = 12 , कर्ण = -13
लम्ब² = कर्ण² - आधार²
= 169 - 144
= 25
लम्ब = 5
अत: sin theta = लम्ब / कर्ण = 5/-13=-5/13
tan theta = लम्ब / आधार = 5/12
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