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Trigonometric Angles

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Trigonometric Angles Trigonometric angles are very easy to learn if u follow some of these steps- From the table ,just learn the values of sin θ  upto 90 and now see that as now move from left to write in sin θ ,the same values will come when you move from right to left in cos θ .Now the next column is of tan θ ,we know that tan θ =sin θ /cos θ ,so we can easy calculate by dividing sin θ  and cos θ .Then next we move on to cot θ ,which can be find out by doing inverse of tan θ  or by dividing cos θ  and sin θ ,as cot θ =1/tan θ  or cot θ =cos θ /sin θ .now go to sec θ ,it is reciprocal of cos θ ,cos θ =1/cos θ ,and at the end it is cosec θ ,which can be find out by finding reciprocal of sin's value,as cosec θ =1/sin θ . Angles can be c omplementary angles and complex angles
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मुझे तो हर शख्स के भीतर इंसान दिखाई देता है .........

मुझे तो हर शख्स के भीतर इंसान दिखाई देता है...  मंदिर  में दान चुगकर चिड़िया  मस्जिद  में पानी पीती है, मैंने सुना है  राधा  की चुनरी कोई  सलमा  बेगम सीती है , एक  रफ़ी  था महफ़िल महफ़िल  रघुपति  राघव गाता था , एक  प्रेमचंद  बच्चो को  ईदगाह  सुनाता था , कभी  कन्हैया  की महिमा गाता  रसखान  सुनाई देता है , औरो को दीखते होंगे  हिन्दू  और  मुसलमान  , मुझे तो हर शख्स के भीतर  इंसान  दिखाई देता है .........
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SCIENCE-10TH CBSE ANSWER KEY

PERIODIC CLASSIFICATION OF ELEMENTS(14-19) Question 14: Element X forms a chloride with the formula XCl2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as Answer:  (b) X would most likely be in the same group of the Periodic Table as magnesium (Mg). Question 15: Which element has (a) two shells, both of which are completely filled with electrons? (b) the electronic configuration 2, 8, 2? (c) a total of three shells, with four electrons in its valence shell? (d) a total of two shells, with three electrons in its valence shell? (e) twice as many electrons in its second shell as in its first shell? Answer:  (a) Neon has two shells, both of which are completely filled with electrons (2 electrons in K shell and 8 electrons in L shell). (b) Magnesium has the electronic configuration 2, 8, 2. (c) Silicon has a total of three shells, with four electrons in its valence shell (2 electr...
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