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Lana 10 AstraFlagship reasoning
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trigonometry_q4.jpgI know the identity, but how do I start the proof?
THE WORKINGBegin with Pythagoras on the unit circle:
x² + y² = r²

01A unit circle has r = 1, so x² + y² = 1.

02Substitute x = cos θ and y = sin θ.

03Therefore sin²θ + cos²θ = 1.

light_refraction_ch10.pptxEDITABLE
CLASS X · PHYSICS · CHAPTER 10Light — Reflection
& Refraction
  • Angle of incidence = angle of reflection
  • Mirror formula: 1/v + 1/u = 1/f
  • Magnification m = −v/u
f = R/202 / 12
6–12NCERT & CBSE classes
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Academic PressPAGE 04
QUICK REVISION · SCIENCE

Electricity in one page

01Current

I = Q / t

02Potential

V = W / Q

03Resistance

R = V / I

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Givenu = 20 m/s, v = 0, t = 4 sFind aa = (v − u)/t = −5 m/s²Uses = ut + ½at²Answers = 40 m
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