evaluate
sin 30°-sin90°+2cos 0° by tan 30° + tan60°
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3 root 3 / 8
sin30=1/2, sin90=1, cos0=1, tan30= 1/root3, tan60= root3
substituting this values in the question we get,
=[(1/2)-1+2] ÷ [1/root 3 + root 3]
=(3/2)÷(4/root3)
= 3root3/8
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