If θ is an acute angle , then find (i) sinπ4-θ2,sin θ=1/25,(ii)cosπ4+θ2, sin θ = 8/9 .

If $θ$ is an acute angle , then find $(i) \sin (\frac{π}{4} - \frac{θ}{2}), s i n θ = 1 / 25, (i i) \cos (\frac{π}{4} + \frac{θ}{2}), \sin θ = 8 / 9$ .

Matching exercise

Match the items on the right to the items on the left.

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