Sin 20 0 -cos 40 0 -tan 45 0 -cos 90 0-

sin20^o×cos40^o×tan45^o×cos90^o =sin20^o×cos40^o×tan45^o×0 =0 ...

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Sign of Trigonometric Ratios in Different Quadrants

sin 20 0 ×cos...

Question

$sin 20^{0} \times cos 40^{0} \times tan 45^{0} \times cos 90^{0}$ =

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