Question

if
$7sin ^{2} a + 3\cos ^{2}a = 4$
find a
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Answer 1

Answer:

One half a convex lems of focal length 20 cm is a black peper

16 the lems produce a complete image of the object

18) Show the formation of image of an object placed Foods

Answer 2

Answer:

here is your answer....... please mark me brainliest

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