Compute exact value of expression by trigonometric identity
1. Use basic trigonometric identies to determine exact value of expression. Provided cos t = 2/3 and sin t< 0, determine sin t.
2. Determine exact value of expression without using the calulator.
sin (pi/15) * cos (4pi/15) + cos(pi/15)*sin(4pi/15)
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Use basic trigonometric identies to determine exact value of expression. Provided cos t = 2/3 and sin t< 0, determine sin t.
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