## The cost of 5 pens and 8 pencils is ₹120 while the cost of 8 pens and 5 pencils is 153. Find the cost of 1 pen and that of 1 pencil.

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This is the basic and conceptual question from linear equations in two variables in which we have been asked to ...Read more

## If x=acos³θ and y=bsin³θ, prove that (x/a)⅔+(y/b)⅔=1

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Sir kindly give me a detailed solution of this question as it is taken from trigonometry, topic – trigonometric identities ...Read more

## Prove that: (sinθ+1-cosθ)/(cosθ-1+sinθ) = (1+sinθ)/cosθ

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This question is from trigonometry topic trigonometric identities in which we have to show that (sinθ+1-cosθ)/(cosθ-1+sinθ) = (1+sinθ)/cosθ RS Aggarwal, Class ...Read more

## Without using trigonometric tables, prove that cos²57° – sin²33° = 0

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This is the basic and conceptual question from trigonometric ratios on complementary angles in which we have to show that ...Read more

## Without using trigonometric tables, evaluate: tan 27°/ cot 63°

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This is the basic and conceptual question from trigonometric ratios on complementary angles in which we have to find tan ...Read more