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If an angle is in the second quadrant and its reference angle is (\frac{5\pi}{18}), what is its principal angle?यदि कोण दूसरे चतुर्थांश में है और उसका संदर्भ कोण (\frac{5\pi}{18}) है, तो उसका मुख्य कोण क्या होगा?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (\frac{13\pi}{18})(\frac{13\pi}{18})
In the second quadrant, the principal angle is (\pi-\alpha). Hence (\pi-\frac{5\pi}{18}=\frac{13\pi}{18}).दूसरे चतुर्थांश में मुख्य कोण (\pi-\alpha) होता है। इसलिए (\pi-\frac{5\pi}{18}=\frac{13\pi}{18}) है।
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