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MHT CET202210 Aug 2022Morning ShiftMathematicsTrigonometric Ratios & IdentitiesActual

^2 (-160^ ) ^2 70^ + (180^ - ) =

Options

  1. A^2 (20^ )
  2. B^2 (20^ )
  3. C^2 (20^ )
  4. Dcosec ^2 (20^ )

Correct answer

A. ^2 (20^ )

Step-by-step solution

aligned & ^2 (-160^ ) ^2 70^ + (180^ - ) & = ^2 (160^ ) ^2 (70^ ) + & = ^2 (90^ +70^ ) ^2 70^ +1 & ^2 70^ ^2 70^ +1 & = ^2 70^ +1= cosec ^2 70^ = ^2 20^ aligned

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