trigonometry question solved in copy
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HannanM:
which grade is this question from
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Since value of sinθ is 1 when θ = π/2, 5π/2, 9π/2,... and -1 when θ = 3π/2, 7π/2, ....
And cosθ is 1 when θ = 0, 2π, 4π,.... and -1 when θ = π, 3π, ....
So
sin(3π/2)sin(7π/2) - cos(5π)cos(6π)
= (-1)(-1) - (-1)(1)
= 1 +1
= 2
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