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5.2 Cont.
Ex. 3 Verifying a Trigonometric Identity
a. (tan2x+1)(cos2x‐1) = ‐tan2x
b. tanx + cotx = secxcscx
c. secx + tanx =
cos x
1‐sinx
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d.
cot2x
1+cscx
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= 1‐sinx
sinx
e. tan4x = tan2xsec2x ‐ tan2x
f. sin3x cos4x = (1‐cos2x) cos4x sinx
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ASSN: p.366 41,43
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