Q.Find the value of (Cosec2 0 - 1) Tan2 o.
Q.Surface area of sphere is 616 cm?, find its radius.
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Step-by-step explanation:
1) (cosec²0 - 1) tan²0
cot²0 * tan²0. [cosec²0 = 1+ cot²0]
1/ tan²0 * tan²0. [ cot²0 = 1/tan²0]
1*1
1
2) saurface area of sphere = 4π r²
616= 4π r²
616/4π= r²
49 = r²
± 7cm = r
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