Question

calculate sin 105°and cos 15°

Answer 1

sin 105°
cos 15°= sin (90 +15)° = sin 105 °

SIN 105 °+SIN 105°= SIN 210......

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Answer 2

Given: sin 105°+cos 15°

To find: the value of given trigonometric function.

Step-by-step explanation:

Step 1 of 1

We know that $cos(90-a)=sina$ and $sin(90-a)=cosa$.

And $sin(90+a)=-cosa$

Using these equations the given equation can be expressed as:

$sin 105^{o} +cos 15^{o}=sin(90+15)^{o} +cos15^{o} \\\\=-cos15^{o} +cos15^{o} \\\\=0$

sin 105°+cos 15°=0