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OpenStudy (anonymous):
Find the exact value of (sin7.5cos7.5)(sin7.5+cos7.5)(sin7.5-cos7.5)(tan7.5)(cot7.5)
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OpenStudy (anonymous):
This is in degrees
OpenStudy (anonymous):
it is -1/8 i think
OpenStudy (anonymous):
It is, but I don't know how to get there
OpenStudy (anonymous):
yes here are steps (sin7.5cos7.5)it is (sin15)/2 then (sin7.5+cos7.5)(sin7.5-cos7.5)=-cos15 then tanxcotx=1 so at last u get -(sin15.cos15)/2 then it is -(sin30)/4 which is equal to -1/8
OpenStudy (anonymous):
hope u get it cleared @MrFrizzy
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OpenStudy (anonymous):
Where did you get the 4 from in -(sin30)/4??
OpenStudy (anonymous):
it simply sinxcosx=(sin2x)/2
OpenStudy (anonymous):
Ah, I see now! Thanks!
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