# If cosx=4/5,cscx<0,then:sin 2x=_____                  cos 2x=_____            tan 2x=_________f sinx =−3/5, in quadrant III, then:sin 2x=_____ cos 2x=_____ tan 2x=_________If tan x=−1/3,cosx>0,then:sin (2x)=_____       cos (2x)=_____              tan (2x)=_________ Using a double-angle or half-angle formula to simplify the given expressions.(1) If cos2(37∘)−sin2(37∘)=cos(A∘),then:A=___________degrees2) If cos2(7x)−sin2(7x)=cos(B),then:B=___________

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If cosx=4/5,cscx<0,then:

sin 2x=_____                  cos 2x=_____            tan 2x=_________

f sinx =−3/5, in quadrant III, then:

sin 2x=_____ cos 2x=_____ tan 2x=_________

If tan x=−1/3,cosx>0,then:

sin (2x)=_____       cos (2x)=_____              tan (2x)=_________

Using a double-angle or half-angle formula to simplify the given expressions.

(1) If cos2(37∘)−sin2(37∘)=cos(A∘),then:

A=___________degrees

2) If cos2(7x)−sin2(7x)=cos(B),then:

B=___________

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