Question

Auswer all questions
(a) Find the value of
cos 15° + sin 15°
cos 15! - sin 15°​

Answer 1

Step-by-step explanation:

here, cos 15° + sin 15°

according to equation,

sin (90 - angle) = cos

so,

sin (90°-15°) + sin 15°

sin 75° + sin 15°

sin 90°

and we know

sin 90° = 1

according to table of ratios of trigonometry.

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Answer 2

Answer:

cos15°=√3/4 and sin15°= 1/2

therefore = sin15°+ cos15°

= √3/4+1/2

= (√3+2)/4

and cos15°-sin15°

= √3/4-1/2

= (√3-2)/4