How do you write the expression as the sine, cosine, or tangent of the angle given $sin60^circcos45^circ-cos60^circsin45^circ$ ?

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Answer 1 · 2017-02-17T00:54:52

sin (105)

Use trig identity:
sin (a - b) = sin a.cos b - sin b.cos a
sin (105) = sin (60 - 45) = sin 60.cos 45 - sin 45.cos 60

How do you write the expression as the sine, cosine, or tangent of the angle given sin60^circcos45^circ-cos60^circsin45^circsin60^circcos45^circ-cos60^circsin45^circ?