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9 October, 11:43

Tan65°-tan25°=2tan40° prove!

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  1. 9 October, 14:20
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    tan65 - tan40 = tan 25 + tan 40.

    using tanA - tan B = sin (A - B) / cosAcosB and tanA + tan B

    = sin (A + B) / cosAcosB

    = we get : : to prove sin 25 / cos65

    = sin65 / cos25 sin 25 = cos (90 - 25)

    = cos 65 and sin 65

    = cos (90 - 65)

    = cos 25

    -Leah
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