Question

Express sin 75 degrees + cos 65° in the terms of trigonometry ratios of angles between zero degree and 45 degree​

Answer 1

Answer:We know that ,

i ) Sin( 90 - A ) = cosA

ii ) Cos ( 90 - A ) = sinA

Here ,

sin 75° + cos 65°

= sin ( 90 - 15 ) + cos ( 90 - 25 )

= cos 15° + sin 25°

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