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anonymous
 4 years ago
sin25° = a and cos40°=b
Express the following in terms of a and b
(1tan155° sin295° ) / (tan410° cos 230° )
anonymous
 4 years ago
sin25° = a and cos40°=b Express the following in terms of a and b (1tan155° sin295° ) / (tan410° cos 230° )

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I just click wrongly :(

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\(\tan 155 = \tan(18025) =\cdots \)

JamesJ
 4 years ago
Best ResponseYou've already chosen the best response.0Yes, for each of the trig terms, you want to figure out how to write them as differences like this from standard trig functions. For example, with the one above: because tan(180) = 0 and tan(x) = tan(x), it follows that tan(18025) = [ tan(180)  tan(25) ] / [ 1  tan(180).tan(25) ] =  tan(25) =  sin(25)/sqrt(1sin^2(25)) =  a/sqrt(1a^2)
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