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<blockquote data-quote="MathLover1" data-source="post: 1099715" data-attributes="member: 280">first cot(u)=3-&gt; cot(18.43 °)&nbsp; I quadrant (given pi&lt;u&lt;3pi/2)thensin(u)=1/sqr(10)cos(u)=3/sqr(10)<img src="https://www6b3.wolframalpha.com/Calculate/MSP/MSP17221hcb438fcb84fd1f00001ai7b128hh86523i?MSPStoreType=image/gif&amp;s=12" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://www6b3.wolframalpha.com/Calculate/MSP/MSP4589222hh5hgg0dgig3600003bhee841370ieeih?MSPStoreType=image/gif&amp;s=15" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://www6b3.wolframalpha.com/Calculate/MSP/MSP11861cee7b63c5gh560a00005ib7bia0579di554?MSPStoreType=image/gif&amp;s=19" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /><img src="https://www6b3.wolframalpha.com/Calculate/MSP/MSP2509145f0e68f219ei4b00002cg61i18gefi5di6?MSPStoreType=image/gif&amp;s=16" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" />.....rationalize<img src="https://www6b3.wolframalpha.com/Calculate/MSP/MSP4079222hh6i28bea431100003d79c3ia9i5d5223?MSPStoreType=image/gif&amp;s=15" alt="" class="fr-fic fr-dii fr-draggable " data-size="" style="" /></blockquote>

[QUOTE="MathLover1, post: 1099715, member: 280"] first cot(u)=3-> cot(18.43 °) [B]I quadrant [/B](given [B]pi<u<3pi/2[/B]) then [B]sin(u)=1/sqr(10) cos(u)=3/sqr(10) [IMG]https://www6b3.wolframalpha.com/Calculate/MSP/MSP17221hcb438fcb84fd1f00001ai7b128hh86523i?MSPStoreType=image/gif&s=12[/IMG] [B] [IMG]https://www6b3.wolframalpha.com/Calculate/MSP/MSP4589222hh5hgg0dgig3600003bhee841370ieeih?MSPStoreType=image/gif&s=15[/IMG][/B] [IMG]https://www6b3.wolframalpha.com/Calculate/MSP/MSP11861cee7b63c5gh560a00005ib7bia0579di554?MSPStoreType=image/gif&s=19[/IMG] [IMG]https://www6b3.wolframalpha.com/Calculate/MSP/MSP2509145f0e68f219ei4b00002cg61i18gefi5di6?MSPStoreType=image/gif&s=16[/IMG].....rationalize [IMG]https://www6b3.wolframalpha.com/Calculate/MSP/MSP4079222hh6i28bea431100003d79c3ia9i5d5223?MSPStoreType=image/gif&s=15[/IMG] [/B] [/QUOTE]