if 2 sin square thetha - cos square thetha =2 , find the value of thetha
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theta must be equal to 90 degree
joGrewal:
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2 sin²Ф - cos²Ф= 2
=>2 sin²Ф -2 = cos²Ф
=>2(sin²Ф - 1) = cos²Ф
=> 2(sin²Ф - (sin²Ф + cos²Ф))=cos²Ф
=>2(sin²Ф -sin²Ф -cos²Ф)=cos²Ф
=>2(-cos²Ф)=cos²Ф
=>3cos²Ф=0
=>cos²Ф=0
=>cosФ=0=cos90°
so, Ф=90°
hope u understand. please do mark as brainliest
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