Question

$sin25.sin45 + cos52 + cos48$
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Answer 1

$\mathfrak{Question}$

sin25.sin45 + cos52 + cos48

$\mathfrak{Answer}$

➪ sin 45°. sin 45° + cos 52° + cos 48°

➪ sin ( 90° - 45° ) . sin ( 90° - 45° ) + cos ( 90° - 38° ) + cos (90° - 42°)

➪ cos 45°. cos 45° + sin 38° + sin 42°

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${\tt{{\underline{\underline{formula \: used}}}}}$

✔ cos ( 90° - A° ) = sin A

✔ sin ( 90° - A° ) = cos A

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Other formulas:-

✔ tan ( 90° - A° ) = cot A

✔ sec ( 90° - A° ) = cosec A

✔ cosec ( 90° - A° ) = sec A

✔ cot ( 90° - A° ) = tan A

Answer 2

Answer:

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Explanation:

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sin25.sin45 + cos52 + cos48

\mathfrak{Answer}Answer

➪ sin 45°. sin 45° + cos 52° + cos 48°

➪ sin ( 90° - 45° ) . sin ( 90° - 45° ) + cos ( 90° - 38° ) + cos (90° - 42°)

➪ cos 45°. cos 45° + sin 38° + sin 42°

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